The Yellow-crowned Amazon (Amazona ochrocephala) complex includes several forms that are regarded as subspecies by some authorities and as full species by others. Juniper and Parr (1998) recognized three distinct species: the Yellow-crowned Amazon (A. ochrocephala), the Yellow-headed Amazon (A. oratrix), and the Yellow-naped Amazon (A. auropalliata). However, they noted that the status of these taxa was unresolved and that, for example, the presence of forms intermediate between the Yellow-headed Amazon and Yellow-naped Amazon suggests that they might better be treated as belonging to a single species. They also pointed out that clarifying the situation is made more complex by possibly age-related plumage variation and substantial individual variation within currently recognized subspecies. Although Juniper and Parr provisionally recognized three distinct species, for similar reasons Collar (1997) and others have provisionally treated the various forms as members of a single highly variable species. Subsequent molecular phylogenetic studies have revealed even more taxonomic complexity. Investigations by Eberhard and Bermingham (2004) and Russello and Amato (2004) indicated that the Blue-fronted Amazon (A. aestiva) may in fact be nested within the Yellow-Crowned complex (Russello and Amato concluded that the Yellow-shouldered Amazon, A. barbadensis, also falls within this group). Further sampling and analysis by Ribas et al. (2007) provided additional evidence indicating that actual evolutionary relationships among genetic lineages in this group may not be well reflected by the plumage variations by which the traditional taxa are defined (see below). (Ribas et al. and references therein should be consulted for more details.)
As traditionally defined, "Yellow-crowned Amazons" are mainly green with yellow feathers on the forehead and forecrown, sometimes extending onto the lores (the area between the bill and the eyes) and around the eyes. and often with a red spot at the base of the upper mandible (birds in the western Amazon basin have a green forehead). "Yellow-headed Amazons" are similar in appearance but have yellow extending over the entire head (immatures are largely green with little or no yellow on the head and little or no red and yellow on the wing). "Yellow-naped Amazons" have yellow limited to the nape and, sometimes, the forehead and forecrown.
Yellow-crowned Amazons move quietly in the treetops and fly well above the canopy with rapid, shallow wingbeats. They are found in tropical deciduous woodland, tall thorn scrub, humid gallery forest, seasonally flooded forest and secondary riverine growth, mangroves, pine savanna, Maurita palm stands in wetter open areas, cultivated land with remnant groves of trees, and even some suburban areas. They occur mostly in lowlands below 500 m. Nests are in tree cavities at 6 to 15 m. The "Yellow-headed Amazon" is endangered, although some of the other forms are locally quite common (e.g., "Yellow-crowned Amazon" in parts of Peru and Brazil).
"Yellow-headed Amazons" are confined to Middle America in Mexico, Belize, extreme eastern Guatemala, and extreme northwestern Honduras. Feral populations are established in Miami (Florida, U.S.A.) and Puerto Rico. These birds are local and uncommon throughout most of their range, with populations severely depleted by habitat loss and trapping for the pet trade both within and outside the native range. "Yellow-naped Amazons" occur in Middle America in the eastern Pacific lowlands of Mexico, Guatemala (possibly), El Salvador (lower arid tropical zone), Honduras, and Nicaragua to northwestern Costa Rica (from the southern end of the Gulf of Nicoya northward). The "Yellow-crowned Amazon" is found in Panama (and possibly Honduras) in Middle America and in South America south to eastern Brazil and northern Bolivia (it is rare in Trinidad).
(Collar 1997 and references therein; Juniper and Parr 1998 and references therein)
Global Range: RESIDENT: Northern Honduras (possibly introduced); Panama; northwestern, northern, and eastern Colombia, Venezuela (except Andean region), and Guianas, south and east of the Andes, to eastern Ecuador, eastern Peru, northern Bolivia, and Amazonian northern Brazil (see Sibley and Monroe 1990 for further details). Introduced in Puerto Rico (small numbers in various locations along north coast) and southern California.
Amazona ochrocephala is found from central Mexico to central South America, including to the southern Amazonian Basin east to Peru, and including Trinidad and other Carribean Islands. They have been introduced to southern California and south Florida.
Biogeographic Regions: nearctic (Introduced ); neotropical (Native )
occurs (regularly, as a native taxon) in multiple nations
Regularity: Regularly occurring
Type of Residency: Year-round
Yellow-crowned parrots have a mass of 402 to 561 g and are usually around 35 cm in length. They generally have bright green feathers edged in black with yellow markings on the head and face. Yellow-crowned parrots have yellow feathers directly above the beak. The cere and hairs around the nostrils are black. The beak is usually dark gray to black. The tail is short (about 10.16 cm) and squared-off at the base. Males and females are similar.
Range mass: 405 to 561 g.
Average length: 35 cm.
Range wingspan: 20.3 to 21.6 cm.
Sexual Dimorphism: sexes alike
Other Physical Features: endothermic ; bilateral symmetry
Length: 35 cm
Yellow-crowned parrots are found in a variety of habitats ranging from humid lowlands and tropical forests to deciduous woodlands and tall scrubland. They can also be found in pine forests and agricultural areas.
Range elevation: 0 to 900 m.
Habitat Regions: temperate ; tropical ; terrestrial
Terrestrial Biomes: forest ; rainforest ; scrub forest
Other Habitat Features: agricultural
Habitat and Ecology
Comments: ALL SEASONS: Forest, woodland, savanna, farmlands (Sibley and Monroe 1990). BREEDING: In Puerto Rico, known to nest in a hollow royal palm on the golf course of the Dorado Beach Hotel (Raffaele 1989).
Non-Migrant: No. All populations of this species make significant seasonal migrations.
Locally Migrant: No. No 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.
Yellow-crowned parrots are opportunistic feeders and gather in treetops in parties of around ten to feed. They eat seeds, nuts, fruits, berries, blossoms and leaf buds. They use their feet to manipulate food and extract nut kernels with their beak and tongue. Yellow-crowned parrots are fond of maize and cultivated fruits.
Plant Foods: seeds, grains, and nuts; fruit; flowers
Primary Diet: herbivore (Frugivore , Granivore )
Yellow-crowned parrots eat seeds, nuts, fruits, and berries, and are important seed predators and seed dispersers.
Ecosystem Impact: disperses seeds
Yellow-crowned parrots do not have many predators as adults. Natural predation on yellow-crowned parrots is primarily from boa constrictors (Boa constrictor), accounting for a 9.5% decrease in breeding success each year. Boa constrictors feed on fledgings and females found in or around the nest. Poaching by humans is the primary cause of breeding failure. Because of combined predation by snakes and poaching by humans, yellow-crowned parrots have very low breeding success (10-14%).
- boa constrictors (Boa constrictor)
- humans (Homo sapiens)
Life History and Behavior
Yellow-crowned parrots give off a variety of metallic shrieks, whistles, squawks, and repeated screeches. Like other parrots, they have a complex and flexible repertoire, giving them the ability to mimic human speech. They also use visual perception for courtship displays.
Communication Channels: visual ; acoustic
Other Communication Modes: mimicry
Perception Channels: visual ; tactile ; acoustic ; chemical
Yellow-crowned parrots, like most large parrots, have a very long lifespan. Little is known about the lifespan of yellow-crowned parrots in the wild. In captivity large parrots can live for up to 100 years.
Status: wild: 56 (high) years.
Status: captivity: 56 years.
Lifespan, longevity, and ageing
Yellow-crowned parrots are monogamous birds. They have simple courtship displays for attracting mates that include bowing, wing-drooping, wing-flicking, tail-wagging, foot-raising, and dilation of the eye pupils. When roosting, pairs remain close together.
Mating System: monogamous
The breeding period for yellow-crowned parrots is December through May. In this time, they lay clutch sizes of 2 to 4 eggs, laying only one clutch per season. It takes about 25 days for the eggs to hatch and about 56 days for them to become fledglings. Offspring become independent about 2 months after they hatch. Both male and female yellow-crowned parrots reach sexual maturity at about 3 years.
Breeding interval: Yellow-crowned parrots breed once yearly.
Breeding season: Breeding occurs from December through May.
Range eggs per season: 2 to 4.
Range time to hatching: 24 to 27 days.
Average time to hatching: 25 days.
Average fledging age: 56 days.
Average time to independence: 2 months.
Range age at sexual or reproductive maturity (female): 2 to 4 years.
Range age at sexual or reproductive maturity (male): 2 to 4 years.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; oviparous
Up to one month before the first egg is layed, female A. ochrocephala prepare a nest in a tree hollow. The female lays a clutch of 2 to 4 eggs (at 2 day intervals) which she incubates for 24 to 27 days. The eggs are plain white with no shell markings and have an elliptical shape. During this time, the male remains close to the nest entrance and feeds the female. After hatching, the female remains with the young for most of the day, occasionally taking breaks to forage. A few days after the eggs hatch, the male begins to enter the nest cavity to feed the young, although the female still does the majority of the feeding.
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)
Nesting has been observed February to June in Puerto Rico (Raffaele 1989).
Molecular Biology and Genetics
Barcode data: Amazona ochrocephala
Below is a 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 and other sequences.
-- end --
Download FASTA File
Statistics of barcoding coverage: Amazona ochrocephala
Public Records: 4
Specimens with Barcodes: 32
Species With Barcodes: 1
Yellow-crowned parrots have a "least concern" rating on the IUCN Red List. However, along with most other parrots, they have a CITES Appendix I status.
US Migratory Bird Act: no special status
US Federal List: no special status
CITES: appendix i
State of Michigan List: no special status
IUCN Red List of Threatened Species: least concern
IUCN Red List Assessment
Red List Category
Red List Criteria
National NatureServe Conservation Status
Rounded National Status Rank: NNA - Not Applicable
NatureServe Conservation Status
Rounded Global Status Rank: G4 - Apparently Secure
Relevance to Humans and Ecosystems
Their love of cultivated fruits makes yellow-crowned parrots pests to orchard and farm owners in their range. They cause damage to maize and fruit crops.
Negative Impacts: crop pest
Yellow-crowned parrots have an uncanny ability to mimic human speech. Because of this ability they are popular as pets. Feathers are sometimes used in native decoration and Amazon parrots in general are popular with birders, encouraging ecotourism in their native ranges.
Positive Impacts: pet trade ; body parts are source of valuable material; ecotourism
The yellow-crowned amazon or yellow-crowned parrot (Amazona ochrocephala), is a species of parrot, native to the tropical South America and Panama. The taxonomy is highly complex, and the yellow-headed (A. oratrix) and yellow-naped amazon (A. auropalliata) are sometimes considered subspecies of the yellow-crowned amazon. Except in the taxonomic section, the following deals only with the nominate group (including subspecies xantholaema, nattereri and panamensis).
Subspecies in the nominate group (including subspecies xantholaema, nattereri and panamensis) have a total length of 33–38 cm (13–15 in). As most other amazon parrots, it has a short squarish tail and primarily green plumage. It has dark blue tips to the secondaries and primaries, and a red wing speculum, carpal edge (leading edge of the wing at the "shoulder") and base of the outer tail-feathers. The red and dark blue sections are often difficult to see when the bird is perched, while the red base of the outer tail-feathers only infrequently can be seen under normal viewing conditions in the wild. The amount of yellow to the head varies, with nominate, nattereri and panamensis having yellow restricted to the crown-region (occasionally with a few random feathers around the eyes), while the subspecies xantholaema has most of the head yellow. All have a white eye-ring. They have a dark bill with a large horn (gray) or reddish spot on the upper mandible except panamensis, which has a horn colored beak. Males and females do not differ in plumage. Except for the wing speculum, juveniles have little yellow and red to the plumage.
Habitat and distribution
The yellow-crowned amazon is found in the Amazon Basin and Guianas, with additional populations in north-western South America and Panama. It is a bird of tropical forest (both humid and dry), woodland, mangroves, savanna and may also be found on cultivated land and suburban areas. In the southern part of its range, it is rarely found far from the Amazon Rainforest. It is mainly a lowland bird, but has locally been recorded up to 800 m (2600 ft) along on the eastern slopes of the Andes.
Food and feeding
They are normally found in pairs or small flocks up to 30, but larger groups may gather at clay licks. Their food includes fruits, nuts, seeds and berries. Foods with sugar and a large amount of salt can be dangerous for them.
The Amazona ochrocephala complex, which has been described as "a taxonomic headache", is considered a single species by some authorities and split into three species, A. ochrocephala (yellow-crowned amazon), A. auropalliata (yellow-naped amazon) and A. oratrix (yellow-headed amazon), by others. The split is mainly based on the amount of yellow in the plumage, the color of the legs and bill, the close proximity of the oratrix group and auropalliata group in Oaxaca, Mexico, without apparent interbreeding, and the presence of members of both the nominate group and the auropalliata group in northern Honduras. This evaluation has, however, been confused by misunderstandings regarding the plumage variations in the populations in northern Honduras, where birds vary greatly in amount of yellow on the head, crown and nape, but have pale bills and a juvenile plumage matching the oratrix group, but neither the nominate nor the auropalliata group. The taxon caribaea from the Bay Islands is a member of the auropalliata group, and occurs in relatively close proximity to the members of the oratrix group. As caribaea may have a relatively pale lower mandible, this could indicating a level of gene flow between this and the nearby taxa of the oratrix group. If confirmed, this could suggest that the two are better considered conspecific. Alternatively, it has been suggested that caribaea and parvipes, both typically placed in the auropalliata group, may be closer to the oratrix than they are to the auropalliata sensu stricto. Both are relatively small and have red to the shoulder as in the members of the oratrix group, but unlike auropalliata sensu stricto.
The members of this complex are known to hybridize in captivity, and recent phylogenetic analysis of DNA did not support the split into the three "traditional" biological species, but did reveal three clades, which potentially could be split into three phylogenetic species: A Mexican and Central American species (incl. panamensis, which extends slightly into South America), a species of northern South America (northern nominate), and a species from the southern Amazon Basin (nattereri, xantholaema and southern nominate). The Central American clade can potentially be split further, with panamensis and tresmariae recognized as two monotypic species. The members of the clade from the southern Amazon Basin should arguably be included as subspecies of the Blue-fronted Amazon, as they are closer to each other than to the northern clades. Disregarding these problems, the following taxa are part of the Amazona ochrocephala complex as traditionally delimited:
- nominate group ("true" yellow-crowned amazon):
- Amazona o. ochrocephala: East-central and south-eastern Colombia, Venezuela, Trinidad, Guyana, Suriname, French Guiana and the northern and eastern Amazon Basin in Brazil.
- Amazona o. xantholaema: Marajó Island, in the Amazon River delta of north-eastern Brazil.
- Amazona o. nattereri: Far south-eastern Colombia, eastern Ecuador, eastern Peru, northern Bolivia and south-western Amazon Basin of Brazil (east to around Mato Grosso). Often included in A. o. ochrocephala.
- Amazona o. panamensis: Western Panama to north-western Colombia; sometimes called the Panama Amazon
- auropalliata group (yellow-naped amazon):
- oratrix group (yellow-headed amazon):
Of these, hondurensis was only recently described, while the population in north-western Honduras and adjacent eastern Guatemala (near Puerto Barrios) resembles belizensis and commonly is included in that subspecies, but may actually represent an undescribed subspecies. It has sometimes been referred to as guatemalensis, but until officially described, the name remains provisional. An additional subspecies, magna, has sometimes been recognized for the population on the Gulf slope of Mexico, but today most authorities consider it invalid, instead including this population in oratrix.
The yellow-crowned amazon is considered to be of least concern by BirdLife International, and consequently, also by IUCN. Although populations are believed to be in decline, they do not yet approach the threshold specified by BirdLife International to rate the species as near threatened. As is the case with most parrots, it is listed on appendix II of CITES. It occurs in numerous protected areas, and remains fairly common throughout a large part of its range.
- BirdLife International (2012). "Amazona ochrocephala". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Juniper, T., & M. Parr. 1998. A Guide to the Parrots of the World. Pica Press, East Sussex. ISBN 1-873403-40-2
- Steven Hilty (2003). Birds of Venezuela, 2nd edition. Princeton University Press. ISBN 0-691-02131-7.
- Schulenberg, T., D. Stotz, D. Lane, J. O'Neill, & T. Parker III. 2007. Birds of Peru. Princeton University Press. ISBN 978-0-7136-8673-9
- Collar, N. 1997. Amazona ochrocephala (Yellow-crowned parrot). Pp 473-474 in: del Hoyo, J., A. Elliott & J. Sargatal. Eds. 1997. Handbook of the Birds of the World. Vol. 4. Sangrouse to Cuckoos. Lynx Edicions, Barcelona. ISBN 84-87334-22-9
- Alderton, David (2003). The Ultimate Encyclopedia of Caged and Aviary Birds. London, England: Hermes House. p. 231. ISBN 1-84309-164-X.
- Steve N. G. Howell and Sophie Webb (1995). A Guide to the Birds of Mexico and Northern Central America. Oxford University Press. ISBN 0-19-854012-4.
- Binford, L. (1989). A distributional survey of the birds of the Mexican state of Oaxaca. Ornithological Monographs. 43: 1–418.
- Monroe, B., Monroe, JR. & T. Howell. (1966). Geographic variation in Middle American parrots of the Amazona ochrocephala complex. Occasional Papers of the Museum of Zoology, no. 34. Louisiana State University, Baton Rouge.
- Lousada, S., & S. Howell. 1996. Distribution, variation, and conservation of Yellow-headed Parrots in northern Central America. Cotinga 5: 46-53.
- Lousada, S. 1989. Amazona auropalliata caribaea: A new subspecies of parrot from the Bay Islands, northern Honduras. Bull. BOC 109: 232-235.
- Eberhard, J., & E. Bermingham. 2004. Phylogeny and Biogeography of the Amazona ochrocephala (Aves: Psittacidae) Complex. Auk 121(2): 318-332
- Russello, M. A., & Amato, G. (2004). A molecular phylogeny of Amazona: implications for Neotropical parrot biogeography, taxonomy, and conservation. Molecular Phylogenetics and Evolution. 30(2): 421-437
- Ribas, C. C., Tavares, E. S., Yoshihara, C., & Miyaki C. Y. (2007). Phylogeny and biogeography of yellow-headed and blue-fronted parrots (Amazona ochrocephala and Amazona aestiva) with special reference to the South American taxa. Ibis 149: 564-574
- Lousada, S., & S. Howell. 1997. Amazona oratrix hondurensis: A new subspecies of parrot from the Sula Valley of northern Honduras. Bull. BOC 117: 203-223.
- Clements, J. 2007. The Clements Checklist of the Birds of the World. Christopher Helm. ISBN 978-0-7136-8695-1
- CITES listings. Retrieved on 2 February 2008
Names and Taxonomy
Comments: Often has been regarded as conspecific with A. oratrix and A. auropalliata, but lack of evidence of interbreeding in areas of near or actual overlap in Oaxaca and Honduras suggests allospecies treatment (Sibley and Monroe 1990).