Articles on this page are available in 1 other language: Spanish (7) (learn more)

Overview

Distribution

occurs (regularly, as a native taxon) in multiple nations

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Global Range: (>2,500,000 square km (greater than 1,000,000 square miles)) Short-tailed hawk is resident locally in peninsular Florida (from St. Marks and San Mateo south to southern Dade County, in winter mostly south of Lake Okeechobee; AOU 1998); and from central Sonora and Tamaulipas in mexico south through Middle America and South America west of the Andes to western Ecuador and east of the Andes to northern Argentina, Paraguay, and southern Brazil (AOU 1998). This species apparently also nests in southeastern Arizona (Troy Cormon, pers. comm., 2005).

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Range Description

This species is widespread throughout south and central America (AOU 1983, Sibley and Monroe 1990, Howell and Webb 1995a). It is resident locally in peninsular Florida (USA), and from Sinaloa and Tamaulipas (Mexico) south through Belize, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica and Panama, to Colombia, Venezuela, Trinidad and Tobago, Guyana, Suriname, French Guiana, Ecuador, Peru, Bolivia, Argentina, Paraguay and Brazil (Sibley and Monroe 1990).
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Geographic Range

Short-tailed hawks occur in the Nearctic and Neotropical regions. In the United States, short-tailed hawks reside mainly in southern Florida. In recent years they have been expanding their range northward to southern Texas, Arizona, and New Mexico, although no breeding has yet been reported in these states. Their range extends from the northern areas of Mexico to as far south as northern Argentina. A related taxon, Buteo albigula, which occurs in the temperate zone of the Andes and parts of Chile, was formerly considered a subspecies of short-tailed hawks but it is now generally given full species status.

Many populations appear to be migratory. Populations in Mexico may migrate as far south as Costa Rica. The population in Florida is disjunct by about 800 km from other populations and is partially migratory. In that population, individuals breed throughout most of the peninsula north to north-central Florida, but migrate during the winter to the southern tip of the peninsula and some of the Florida Keys. Populations from Panama and throughout South America are not known to migrate.

Biogeographic Regions: nearctic (Native ); neotropical (Native )

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 1 person

Average rating: 2.0 of 5

Physical Description

Morphology

Physical Description

Short-tailed hawks, one of the smaller species of Buteo, are crow-sized birds. They are 39 to 44 cm in length with a wingspan of 83 to 103 cm. The tail grows to 132 to 340 mm. Average mass is 441 grams. Females are larger than males, weighing on average 515 grams, while males weigh 392 grams on average. Though females are larger than males, the sexes are similar in the field. They have relatively long wings for their size; when perched, the wings reach the tail tip, giving these hawks their name due to the appearance of having an unusually short tail. In reality tail length is typical of the genus. The bill is black with a bluish-black base and a cere that varies from yellow to greenish-yellow. The legs and feet are light yellow to lemon yellow while the talons are black. The iris of Florida birds are dark brown in adults and lighter brown in juveniles. Museum specimens from tropical areas have irises ranging from yellow to yellowish-brown to brownish-yellow.

Short-tailed hawks occur in distinct light and dark color morphs with no intermediates. The light morph has white, unmarked underparts and underwing coverts while the head is a very dark blackish brown except for the anterior portions of the malar region, lores, chin, and throat, creating the effect of a dark hood. The upper parts and upper wing coverts are a uniform blackish brown with small patches of rufous brown on the sides of the upper breast, sides of the rump, and the scapulars. The tibial and crural feathers are pale buff. The under surface of the flight feathers is pale grayish with many narrow brownish bars and one wide dark terminal band along the trailing edge of the wing. The primaries are palest at the base of the outer first through fifth primaries, creating a diagnostic white oval. The rectrices appear grayish-brown above and grayish-white below with 4 to 5 narrow, incomplete brown bands and a dark terminal band. The tip of the tail feathers are pale gray. Sexes are alike.

The dark morph is almost entirely blackish brown. It lacks the rufous brown on the rump and scapulars and there is a small white patch where the lore and forehead meet. The underwing coverts are dark blackish brown except for the greater secondary and primary underwing coverts, which are mottled with white. The rest of the underwing appears the same as the light morph. Sexes are alike. In Florida, the dark morph is more numerous than the white. In other parts of the species’ range, the dark morph is uncommon or nonexistent.

Immature light morph short-tailed hawks have pale buff or orange-buff on the breast, belly, crural feathers, axillaries, and underwing coverts. The dark bands on the tail are heavier and more numerous than those on the adult, they are all roughly the same width. There are dark-brown streaks on the side of the breast and the edge of the feathers of the nape, scapulars, back, rump, and wing coverts have pale-brown or pale-buffy coloration. Instead of the hood of the adult, light-morph juveniles have ear coverts finely streaked with buff or pale ocher. Dark morph immature hawks have white spots and streaks on their chin, throat, belly, breast, axillaries, and under wing coverts.

There are two recognized subspecies of Buteo brachyurus: B. b. brachyurus and B. b. fuliginosus. Buteo brachyurus brachyurus is found in in South America. It can be distinguished from Buteo brachyurus fuliginosus by having less barring on the tail and no rufous on the side of the neck. Buteo brachyurus fuliginosus is found in Panama and the rest of the North American range. Though they are considered part of the same subspecies, the population of hawks in Florida appears to be larger-bodied than those living in Central and South America. They also have more rufous on their hind neck.

Range mass: 392 to 515 g.

Average mass: 441 g.

Range length: 39 to 44 cm.

Range wingspan: 83 to 103 cm.

Other Physical Features: endothermic ; homoiothermic; bilateral symmetry ; polymorphic

Sexual Dimorphism: sexes alike; female larger

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Size

Length: 39 cm

Weight: 530 grams

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Diagnostic Description

Adult differs from other southeastern U.S. buteos in being either all black or all white below (throat, breast, belly, and wing linings). Light-morph immature resembles immature broad-winged hawk and may not be separable in the field (Johnsgard 1990).

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Ecology

Habitat

Comments: This species occurs in a wide range of habitats. Generally it occupaies open country, from mangrove and cypress swamps to open pine-oak woodland, avoiding heavily forested situations (AOU 1983). It is most common in mixed woodland-savanna habitats (Terres 1980). It hunts over open land.

Nests are in the tops of cypress, pine, or other trees, or in top of mangroves (Terres 1980). Nests may be in dense or open stands of tall trees in either flooded or upland locations, in tall straight trees near near edge of, or at small clearings in, woodlands, or near the tops of trees taller than the surrounding canopy (Palmer 1988), usually at a fork along the major trunk or larger lateral branch. Individuals build a new nest each year or, less often, reuse the same nest in successive years (Palmer 1988).

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Habitat and Ecology

Habitat and Ecology
Tolerant of a wide variety of habitats, it is found in swamps, woodland, forest edge and open country, generally avoiding heavily forested areas (AOU 1983, Howell and Webb 1995a). It occurs from sea level to 2,000 m, and rarely as high as 3,000 m (Howell and Webb 1995a). The populations in Florida and Central America appear to be partially migratory (del Hoyo et al. 1994).

Systems
  • Terrestrial
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Short-tailed hawks breed mainly in tall, dense, wet forest patches near water, such as mangrove and cypress swamps. When not breeding, individuals can be found near coastal areas, forests, forested edges, pine savannas, pastures, suburban areas, and open country. They are not usually found in dense, closed forest. While they often roost and nest in larger trees, they hunt primarily in open country and on forest edges, where wind conditions are best for their unique style of hunting. Buteo brachyurus occurs primarily in lowland and foothill habitats, typically up to 2000 m elevation and occasionally to 3000 m. Robinson et al. (1994) reports short-tailed hawks inhabiting a wide range of habitats in Amazonian Peru, including lake, rivers, pantanal (seasonally flooded wetlands mainly in southern Brazil), transitional forests, and upland forests, though they were considered rare in all of these except pantanal, where they were considered uncommon.

Range elevation: 3000 (high) m.

Habitat Regions: temperate ; tropical ; terrestrial

Terrestrial Biomes: savanna or grassland ; forest ; rainforest ; scrub forest

Aquatic Biomes: coastal

Wetlands: swamp

Other Habitat Features: suburban ; riparian ; estuarine

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Migration

Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.

Locally Migrant: Yes. At least some populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

Migratory in northern part of range in Florida, but moves only to southern Florida (during October and early November); disappears from wintering areas in southern Florida during February-March (Palmer 1988). Some migratory movement is suspected (but not well documented) in Mexico and Central America.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Trophic Strategy

Comments: Florida: specialized hunter of small birds (mostly warbler to mourning dove size); mostly open terrain species; small rodents also recorded. Diet may be more varied in more tropical parts of range, though birds predominate; nonavian items include lizards, snakes, tree frogs, and insects (Palmer 1988). Hunts over forest canopy, along woodlands edges, and well out over adjacent marshes, rough pastures, or prairies; in Florida, hunts over large area, as much as 2-2.5 km in diameter; often searches ground from nearly stationary position in midair (Palmer 1988).

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Food Habits

Short-tailed hawks feed mostly on smaller birds. In Florida, over half their bird diet is made up of eastern meadowlarks (Sturnella magna) and red-winged blackbirds (Agelaius phoeniceus), likely due to the conspicuousness of these species. They prey on adults of these species and have not been observed feeding on nestlings. When hunting, they hover or soar 50 to 300 meters high, with outstretched wings and head held down. From this position, they can dive on birds below. They also prey on lizards, snakes, rodents, and occasional insects (wasps and grasshoppers). They can catch prey on the wing, as well as when the prey is on a conspicuous perch. Ogden et al. (1974) report hunting success to be relatively low (~11%) with only 12 of 107 attempts being successful over the course of 30 hours of observation. Nestlings produce pellets of indigestible material about 30x12 mm in size.

Animal Foods: birds; mammals; reptiles; insects

Primary Diet: carnivore (Eats terrestrial vertebrates)

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Associations

Ecosystem Roles

Short-tailed hawks are important predators, especially of birds, in the ecosystems they inhabit.

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Predation

There are no known predators of adult short-tailed hawks. Crows have been known to rob the nest of eggs.

Known Predators:

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 81 to >300

Comments: This species is represented by a large number of occurrences (subpopulations) throughout the wide range. About 43 breeding season locations indicative of nesting have been documented in Florida since 1951 (Millsap et al. 1996).

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Global Abundance

100,000 to >1,000,000 individuals

Comments: Total population size has been estimated at 500,000-5,000,000 (Rich et al. 2004). This hawk is fairly common in Mexico and northern Central America (Howell and Webb 1995), generally uncommon elsewhere.

Rare and local in Florida. In southern Florida, this species is less numerous than red-tailed and red-shouldered hawks. State population may be fewer than 500.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Life History and Behavior

Behavior

Communication and Perception

The voice of Buteo brachyurus is described as a high-pitched, prolonged “keeeea” and it is often given when humans approach the nest. They also give a "keeee" call at the nest site, especially when males return to incubating females. A "squeee" call is also given before or after copulation and sometimes by a female when she is receiving food from a male. During the non-breeding period, these birds are usually silent. Newly hatched chicks give chip calls singly or in series of 2 to 4. After about four days they will call for food with soft squeals.

Communication Channels: visual ; acoustic

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Cyclicity

Comments: In Florida, perches until conditions suitable for effortless soaring; may spend much of remainder of day in air; aerial activity ceases 1-2 hours before sunset, when bird returns to woodland to roost (Palmer 1988).

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Life Expectancy

Lifespan/Longevity

There is no information on lifespan or survivorship in short-tailed hawks. Recorded causes of death include being shot, as well as being hit by cars. Habitat destruction, especially of winter breeding grounds in Florida, may also contribute to death in short-tailed hawks. Ironically, short-tailed hawks have increased in density in some areas due to logging that has opened up more of the forest edge habitats that it prefers (Thiollay 1999).

  • Thiollay, J. 1999. Responses of an avian community to rain forest degradation. Biodiversity and Conservation, 8: 513-534.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Reproduction

In southern Florida, nest building occurs primarily early from February to mid-March, most pairs completing nests by mid- to late March. In northern Florida, nest completion may extend into April. In Florida, most eggs are laid from mid-March to mid-April. Elsewhere, reported egg dates include March and May in Trinidad, April and October in Panama, March in Chiapas, and February and early April in Veracruz. Clutch size usually is 2, rarely 3. Incubation lasts about 5 weeks, by female (male provides food). Young are tended by both parents. Limited evidence suggests that at least some yearling females may attempt to nest.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

The breeding season of short-tailed hawks is from late January to July. These birds are presumed to be monogamous. Courtship consists of the male circling and undulating above the female who is perched at the nest site. The male then presents prey or nest material to the female. They have also been observed to grasp each others’ talons in the air and tumble earthward. Copulation begins with the male descending and landing near or on the female. He proceeds to give a two-note squeal before mounting for 5 to 7 seconds. Though one male was observed to have had 2 mates over three years, there is little information on the duration of pair bonds. There is no assortative mating between the two color morphs. During the breeding season short-tailed hawks becomes quite secretive and can then be difficult to locate.

Mating System: monogamous

Females create a platform nest made of sticks, lining the interior with finer twigs and soft material such as Spanish moss during incubation and hatching. Males gather nest materials. Nests are around 0.6 to 0.9 meters wide and 0.3 meters deep. Normally, they are located towards the top of taller trees, 9 to 29 meters up, in cypress swamps or mangroves. Less often, nest sites are found in the interior of both closed and open woods and the edges of hammocks. One to three preliminary nests may be constructed before a final nest is chosen. Nests may be reused year after year, and new nests are always located around the same area as previous ones. Only one brood is raised per season.

Buteo brachyurus normally lays two eggs, although clutch size varies from one to three eggs. Typically they are an unspotted bluish-white, although some have reddish brown speckling around the larger end. The eggs are short elliptical or nearly oval shape. The length of time between eggs in a clutch is unknown. Incubation lasts between 34 and 39 days. Females incubate eggs while males provisio females with food.

At hatching, young are covered in white natal down and weigh from 35 to 55 grams. About 2.5 to 3 weeks after hatching, a second layer of gray down is grown. Nestlings are brooded almost continuously as females are absent from the nest less than 10% of the time. Chicks are fed 2 to 3 times a day by both parents. Siblicide has not been well-documented in the species, although observations in captivity suggest that it is a possibility. Length of time to fledging is unknown. One specimen had a mass of 415 grams at fledging. In an estimated 45% of nests, at least one young is successfully raised. The age at sexual maturity is unknown; however first-year birds have not been observed breeding. The timing of molts in this species is also unknown.

Breeding interval: Short-tailed hawks breed once every year.

Breeding season: Short-tailed hawks breed from January to July.

Range eggs per season: 1 to 3.

Range time to hatching: 34 to 39 days.

Range birth mass: 35 to 55 g.

Key Reproductive Features: seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); fertilization

Short-tailed hawk males and females both care for their young until they are fledged and independent.

Parental Investment: altricial ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Male, Female); pre-weaning/fledging (Provisioning: Male, Female, Protecting: Male, Female); pre-independence (Provisioning: Male, Female, Protecting: Male, Female)

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Molecular Biology and Genetics

Molecular Biology

Barcode data: Buteo brachyurus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There is 1 barcode sequence available from BOLD and GenBank.

Below is the sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.

See the BOLD taxonomy browser for more complete information about this specimen.

Other sequences that do not yet meet barcode criteria may also be available.

TCTATACCTAATCTTCGGTGCATGAGCCGGTATAGTCGGCACCGCCCTCAGCCTACTTATTCGTGCAGAACTCGGCCAACCAGGCACACTCCTAGGTGACGACCAGATCTACAACGTAATCGTTACTGCACATGCCTTCGTAATAATCTTCTTCATAGTTATACCAATTATGATTGGAGGCTTCGGAAACTGACTTGTCCCACTCATAATCGGCGCCCCCGACATAGCCTTCCCACGCATAAACAACATAAGCTTCTGACTACTTCCTCCATCCTTCCTCCTCCTCCTAGCCTCCTCAACAGTAGAAGCAGGAGCCGGCACTGGATGAACTGTCTATCCCCCACTGGCTGGCAATATAGCCCATGCCGGAGCTTCAGTAGACCTAGCCATCTTCTCCCTACACTTAGCCGGAGTCTCGTCCATTCTAGGAGCAATCAACTTTATCACAACCGCCATCAACATAAAACCCCCAGCCCTCTCCCAATACCAAACACCCCTATTCGTATGATCCGTCCTCATTACCGCTGTCCTTCTACTACTCTCACTCCCGGTCCTAGCCGCCGGCATTACTATACTGCTTACAGACCGAAACCTAAACACAACATTCTTTGACCCCGCTGGAGGAGGTGATCCCATCCTATACCAACATCTCNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
-- end --

Download FASTA File

Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Statistics of barcoding coverage: Buteo brachyurus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 2
Species With Barcodes: 1
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N2 - Imperiled

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

NatureServe Conservation Status

Rounded Global Status Rank: G4 - Apparently Secure

Reasons: Large range from Florida and Arizona to South America; generally uncommon but fairly common in Mexico and northern Central America; population size probably is at least 500,000 and relatively stable.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2012

Assessor/s
BirdLife International

Reviewer/s
Butchart, S. & Symes, A.

Contributor/s

Justification
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Buteo brachyurus is listed as Least Concern on the IUCN Red List. Short-tailed hawks are protected under the US Migratory Bird Act. They are not given any special status on the US Federal Endangered Species list nor are they listed under CITES Appendix II. Though uncommon to rare throughout most of their range, short-tailed hawks are not currently threatened. The Florida population, however, is at risk due to its small size (estimated at 500 individuals), geographic isolation, poor breeding success, and continuing loss of prairie, swamp forest, and mangroves.

US Migratory Bird Act: protected

US Federal List: no special status

CITES: no special status

State of Michigan List: no special status

IUCN Red List of Threatened Species: least concern

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Global Short Term Trend: Relatively stable (=10% change)

Comments: Better information on trend is needed, but available evidence suuggests that extent of occurence, area of occupancy, number of subpopulations, and population size probably are relatively stable or declining at a rate of less than 10% over 10 years or three generations.

Global Long Term Trend: Increase of 10-25% to decline of 30%

Comments: Global trend has not been quantified, but overall population appears to be secure (del Hoyo et al. 1994) and stable (Ferguson-Lees and Christie 2001). Total range apparently has not been reduced from the historical extent, though important habitats have been destroyed. Possibly the range has expanded northward along both Mexican coasts in recent decades (Ogden 1988). Population in Florida appears to have been relatively stable over the past several decades (Ogden 1988).

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Population

Population
Although uncommon through most of its range and rare in Florida (del Hoyo et al. 1994), it is fairly common in Mexico and northern Central America (Howell and Webb 1995a), and has a large global population estimated to be c.2,000,000 individuals (Rich et al. 2004).

Population Trend
Increasing
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Threats

Degree of Threat: Medium

Comments: In northern and central Florida, nesting habitat has been altered by logging. Threats outside the U.S. are unknown, but habitat alteration probably is a factor.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Management

Biological Research Needs: Research is needed on basic ecology and limiting factors.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Global Protection: Many to very many (13 to >40) occurrences appropriately protected and managed

Comments: Occurrences exist in many protected areas. Within the United States, this species occurs in Everglades National Park, Big Cypress National Preserve, Loxahatchee National Wildlife Refuge, and Key Deer National Wildlife Refuge.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Relevance to Humans and Ecosystems

Benefits

Economic Importance for Humans: Negative

There are no known negative effects of short-tailed hawks on humans.

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Economic Importance for Humans: Positive

Short-tailed hawks may aid farmers by occasionally preying on rodents that feed on their crops.

Positive Impacts: controls pest population

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© The Regents of the University of Michigan and its licensors

Source: Animal Diversity Web

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Wikipedia

Short-tailed hawk

The short-tailed hawk (Buteo brachyurus) is an American bird of prey in the family Accipitridae, which also includes the eagles and Old World vultures. As a member of the genus Buteo, it is not a true hawk and thus also referred to as a "buteo" or (outside North America) "buzzard". The white-throated hawk (B. albigula) is a close relative and was formerly included in the species B. brachyurus.

Range and ecology[edit]

Short-tailed hawks breed in the tropical and subtropical Americas from southeastern Brazil and northern Argentina north through Central America to northern Mexico, as well as in southern Florida, USA. This species is generally found below 4,500 ft (c. 2,000 meters) ASL and most common below 2,500 ft (c.1,400 meters). It is replaced by the white-throated hawk (B. albigula) in the Andes of southern Colombia and south to central Argentina and Chile; the short-tailed hawk is found in the Cordillera Central and Cordillera Occidental of Colombia, while B. albigula occurs south of these locales.[2] As far as is known, B. brachyurus is a year-round resident except that most of the Florida population migrates in winter to the southern tip of the state, including the Keys. It is somewhat habitat adaptable but only passes areas with dense human populations when foraging. The species may be found in wooded savannah, patchy woodlands near water, cypress swamps, mangrove swamps or high pine-oak woodlands. In the tropics, it is most common in lowland foothills.[3]

Most of what is known about its natural history has been studied in the Floridan population, and might not apply to birds at the south of the species' range. In general, this species is associated with woodland, often near water.

In Florida, it eats mainly smaller birds. The short-tailed hawk hunts from soaring flight, often at the borders between wooded and open areas. A frequent maneuver is "kiting" – coming to a stop, the bird heads into the wind, with its wings held stationary. It typically attacks prey with a nearly vertical swoop, sometimes pausing and then continuing downward in a "stair-step" manner. Typical prey ranges from a New World warbler (Parulidae) to a bobwhite (Colinus) in size. In Florida, icterids – namely the red-winged blackbird (Agelaius phoeniceus), the common grackle (Quiscalus quiscula), the boat-tailed grackle (Quiscalus major) and the eastern meadowlark (Sturnella magna) – make up the bulk of the prey. In one case, 95% of a single hawk's prey selection was found to consist of red-winged blackbirds.[4] Hunting success is apparently relatively low. In one study, 30 hours of observation showed that only 12 of 107 hunting attempts (or around 11%) were successfully.[5] There are isolated records of short-tails predating sharp-shinned hawks (Accipiter striatus) and American kestrel (Falco sparverius). Among tropical populations, they are several records of this species regularly taking frogs (especially tree frogs), lizards, large insects such as wasps and locusts. Such prey, which serves merely as alternate foods for Florida populations, apparently provides a much large portion of the diet in tropical populations. In all parts of the range they occasionally supplement their diet with smallish mammal, principally small rodents such as mice or rats. Among the heaviest prey recorded are young common marmosets (Callithrix jacchus) and similar small monkeys; these do not seem to form an important prey item however, and are only snatched when the opportunity presents itself.[6] They are primarily an aerial predator, taking most prey by swooping down to trees or the ground. Rarely, they have been also record still hunting from a perch.[3]

The large stick nest is built in a tree, at a height ranging from 2.5 to 30 m (8.2 to 98.4 ft). In Florida, the bald cypress (Taxodium distichum) is a popular nesting tree of the short-tailed hawk. The nest is bulky, measuring 60–70 cm (24–28 in) wide and 30 cm (12 in) deep. Its 1–3 eggs prer clutch are white, usually with dark spots and blotches. The nesting season is January through June in Florida and is possibly similar in the tropics. Incubation occurs over 34 days with no known details of their fledgling period.[3] In Florida, American crows have been known to consume eggs of this species.[7]

The short-tailed hawk is uncommon and local in most of its range. It is quite difficult to detect unless in flight, since it is often concealed while perched by dense canopy or with only the head showing (unlike most Buteo hawks which generally prefer prominent perches). Due to the fact that it is believed to be regularly overlooked in the field, no comprehensive population surveys have occurred for the species.[3] However, due to its wide extent of occurrence, it is not considered threatened by the IUCN.[1] Sightings of soaring short-tailed hawks are fairly frequent within their range.

References[edit]

  1. ^ a b BirdLife International (2012). "Buteo brachyurus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ Krabbe, Niels; Flórez, Pablo; Suárez, Gustavo; Castaño, José; Arango, Juan David & Duque, Arley (2006). "The birds of Páramo de Frontino, western Andes of Colombia". Ornitologıá Colombiana 4: 39–50. 
  3. ^ a b c d Ferguson-Lees, James and Christie, David A. (2001) Raptors of the World, Houghton Mifflin Harcourt, ISBN 0-618-12762-3
  4. ^ Overview – Short-tailed Hawk (Buteo brachyurus) – Neotropical Birds. Neotropical.birds.cornell.edu. Retrieved on 2012-12-19.
  5. ^ Ogden, J. (1974). "Short-tailed-hawk in Florida. 1. Migration, Habitat, Hunting Techniques". The Auk 91 (1): 95–110. doi:10.2307/4084665. 
  6. ^ de Lyra-Neves, Rachel M.; Oliveira, Maria A.B.; Telino-Júnior, Wallace R. & dos Santos, Ednilza M. (2007). "Comportamentos interespecíficos entre Callithrix jacchus (Linnaeus) (Primates, Callitrichidae) e algumas aves de Mata Atlântica, Pernambuco, Brasil" [Interspecific behaviour between Callithrix jacchus (Linnaeus) (Callitrichidae, Primates) and some birds of the Atlantic forest, Pernanbuco State, Brazil]. Revista Brasileira de Zoologia (in Portuguese with English abstract) 24 (3): 709–716. doi:10.1590/S0101-81752007000300022. 
  7. ^ ADW: Buteo brachyurus: INFORMATION. Animaldiversity.ummz.umich.edu. Retrieved on 2012-12-19.

Further reading[edit]

Creative Commons Attribution Share Alike 3.0 (CC BY-SA 3.0)

Source: Wikipedia

Unreviewed

Article rating from 0 people

Default rating: 2.5 of 5

Short-tailed Hawk

The Short-tailed Hawk (Buteo brachyurus) is an American bird of prey in the family Accipitridae, which also includes the eagles and Old World vultures. As a member of the genus Buteo, it is not a true hawk and thus also referred to as a "buteo" or (outside North America) "buzzard". The White-throated Hawk (B. albigula) is a close relative and was formerly included in the species B. brachyurus.

Description[edit]

The Short-tailed Hawk is a small buzzard. Males average smaller than the females, but the size difference is slighter than in most birds of prey and the sexes are indistinguishable in the field. Length can range from 37 to 45 cm (15 to 18 in), wingspan from 80–103 cm (31–41 in) and body mass from 342 to 625 g (12.1 to 22.0 oz). Among standard linear measurements, the wing chord is 26.5–34 cm (10.4–13.4 in), the tail is 13–18 cm (5.1–7.1 in) and the tarsus is 5.5–6.2 cm (2.2–2.4 in).[2] It has broad rounded wings, the tips of which are curved upwards while soaring, and a broad tail that despite the bird's name is of average length for a buteo in proportion to the body. Its call is a high-pitched scream similar to other buzzards.

One of the most interesting things about this bird is the melanistic "black" phase – this species occurs in two colour morphs, with no intermediates. The dark form predominates in Florida, where it is known as "little black hawk". The light form is common elsewhere in the species' range. In most of the North American buteos – e.g. the Red-tailed Hawk (B. jamaicensis) and Swainson's Hawk (B. swainsoni) – melanistic individuals are known, although wholly black plumage is comparatively rare. Only in the North American population of Buteo brachyurus does it seem to be the prevalent form.

The adult light morph has dark brown upperparts. The underparts are white, except that the tail and flight feathers are grey barred with dark. The immature is similar to the adult but the face is streaked rather than white, and the tail bands are of equal width, whereas the adult has a broad bar near the tail tip. The light morph is considered unmistakable when seen well in flight, due its blackish back and hood in contrast to an otherwise largely white underside.[2]

The adult dark morph has black-brown upperparts and underparts, apart from the tail and flight feathers, which are grey barred with dark as in the light morph but possibly with darker grey. The young bird has the same tail pattern as the light-morph immature, and the underparts are spotted with white. Differentiating the dark morph from other dark morph Buteos is difficult, especially from the closely related Broad-winged Hawk.[2]

For a long time, it was thought that the dark phase of the present bird was a distinct species Buteo fuliginosus. For example, when Robert Ridgway discussed the Short-tailed Hawk collected at Oyster Bay, Lee County, Florida by W. S. Crawford on January 28, 1881, the question whether or not the black birds were of the same species as the light ones was not yet settled.[3]

Range and ecology[edit]

Short-tailed hawks breed in the tropical and subtropical Americas from southeastern Brazil and northern Argentina north through Central America to northern Mexico, as well as in southern Florida, USA. This species is generally found below 4,500 ft (c. 2,000 meters) ASL and most common below 2,500 ft (c.1,400 meters). It is replaced by the White-throated Hawk (B. albigula) in the Andes of southern Colombia and south to central Argentina and Chile; the Short-tailed Hawk is found in the Cordillera Central and Cordillera Occidental of Colombia, while B. albigula occurs south of these locales.[4] As far as is known, B. brachyurus is a year-round resident except that most of the Florida population migrates in winter to the southern tip of the state, including the Keys. It is somewhat habitat adaptable but only passes areas with dense human populations when foraging. The species may be found in wooded savannah, patchy woodlands near water, cypress swamps, mangrove swamps or high pine-oak woodlands. In the tropics, it is most common in lowland foothills.[2]

Most of what is known about its natural history has been studied in the Floridan population, and might not apply to birds at the south of the species' range. In general, this species is associated with woodland, often near water.

In Florida, it eats mainly smaller birds. The Short-tailed Hawk hunts from soaring flight, often at the borders between wooded and open areas. A frequent maneuver is "kiting" – coming to a stop, the bird heads into the wind, with its wings held stationary. It typically attacks prey with a nearly vertical swoop, sometimes pausing and then continuing downward in a "stair-step" manner. Typical prey ranges from a New World warbler (Parulidae) to a bobwhite (Colinus) in size. In Florida, icterids – namely the Red-winged Blackbird (Agelaius phoeniceus), the Common Grackle (Quiscalus quiscula), the Boat-tailed Grackle (Quiscalus major) and the Eastern Meadowlark (Sturnella magna) – make up the bulk of the prey. In one case, 95% of a single hawk's prey selection was found to consist of Red-winged Blackbirds.[5] Hunting success is apparently relatively low. In one study, 30 hours of observation showed that only 12 of 107 hunting attempts (or around 11%) were successfully.[6] There are isolated records of Short-tails predating Sharp-shinned Hawks (Accipiter striatus) and American Kestrel (Falco sparverius). Among tropical populations, they are several records of this species regularly taking frogs (especially tree frogs), lizards, large insects such as wasps and locusts. Such prey, which serves merely as alternate foods for Florida populations, apparently provides a much large portion of the diet in tropical populations. In all parts of the range they occasionally supplement their diet with smallish mammal, principally small rodents such as mice or rats. Among the heaviest prey recorded are young Common Marmosets (Callithrix jacchus) and similar small monkeys; these do not seem to form an important prey item however, and are only snatched when the opportunity presents itself.[7] They are primarily an aerial predator, taking most prey by swooping down to trees or the ground. Rarely, they have been also record still hunting from a perch.[2]

The large stick nest is built in a tree, at a height ranging from 2.5 to 30 m (8.2 to 98.4 ft). In Florida, the Bald Cypress (Taxodium distichum) is a popular nesting tree of the Short-tailed Hawk. The nest is bulky, measuring 60–70 cm (24–28 in) wide and 30 cm (12 in) deep. Its 1–3 eggs prer clutch are white, usually with dark spots and blotches. The nesting season is January through June in Florida and is possibly similar in the tropics. Incubation occurs over 34 days with no known details of their fledgling period.[2] In Florida, American Crows have been known to consume eggs of this species.[8]

The Short-tailed Hawk is uncommon and local in most of its range. It is quite difficult to detect unless in flight, since it is often concealed while perched by dense canopy or with only the head showing (unlike most Buteo hawks which generally prefer prominent perches). Due to the fact that it is believed to be regularly overlooked in the field, no comprehensive population surveys have occurred for the species.[2] However, due to its wide extent of occurrence, it is not considered threatened by the IUCN.[1] Sightings of soaring Short-tailed Hawks are fairly frequent within their range.

References[edit]

  1. ^ a b BirdLife International (2012). "Buteo brachyurus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ a b c d e f g Ferguson-Lees, James and Christie, David A. (2001) Raptors of the World, Houghton Mifflin Harcourt, ISBN 0-618-12762-3
  3. ^ Ridgway, Robert (1881). "Little black hawk collected in Florida". Bulletin of the Nuttall Ornithological Club 6: 207–214. 
  4. ^ Krabbe, Niels; Flórez, Pablo; Suárez, Gustavo; Castaño, José; Arango, Juan David & Duque, Arley (2006). "The birds of Páramo de Frontino, western Andes of Colombia". Ornitologıá Colombiana 4: 39–50. 
  5. ^ Overview – Short-tailed Hawk (Buteo brachyurus) – Neotropical Birds. Neotropical.birds.cornell.edu. Retrieved on 2012-12-19.
  6. ^ Ogden, J. (1974). "Short-tailed-hawk in Florida. 1. Migration, Habitat, Hunting Techniques". The Auk 91 (1): 95–110. doi:10.2307/4084665. 
  7. ^ de Lyra-Neves, Rachel M.; Oliveira, Maria A.B.; Telino-Júnior, Wallace R. & dos Santos, Ednilza M. (2007). "Comportamentos interespecíficos entre Callithrix jacchus (Linnaeus) (Primates, Callitrichidae) e algumas aves de Mata Atlântica, Pernambuco, Brasil" [Interspecific behaviour between Callithrix jacchus (Linnaeus) (Callitrichidae, Primates) and some birds of the Atlantic forest, Pernanbuco State, Brazil]. Revista Brasileira de Zoologia (in Portuguese with English abstract) 24 (3): 709–716. doi:10.1590/S0101-81752007000300022. 
  8. ^ ADW: Buteo brachyurus: INFORMATION. Animaldiversity.ummz.umich.edu. Retrieved on 2012-12-19.

Further reading[edit]

Creative Commons Attribution Share Alike 3.0 (CC BY-SA 3.0)

Source: Wikipedia

Unreviewed

Article rating from 0 people

Default rating: 2.5 of 5

Names and Taxonomy

Taxonomy

Comments: Suggestions that B. albigula of South American Andes and B. brachyurus are conspecific require confirmation (AOU 1983). Some accounts name three subspecies: B. b. fuliginosus (North American and coastal populations), B. b. brachyurus (South American population), and B. b. albigula (Andean populations above 2100 m).

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!