Overview

Comprehensive Description

Medium-sized, long-tailed, scruffy crow with stout bill and bare pink facial skin; sparse nasal and rictal bristles. Plumage is variable, blackish to dark brown or grey, with slightly glossy wings and tail; iris light blue; bill grey; legs pink to grey. Sexes similar. Juvenile much paler than adult, pale grey-brown above, whitish on head and below, appearing rather bleached, with brown eyes and white bill; immature is only marginally less pale, with pink bill and feet (birds with mottled grey-brown eyes are probably immature); takes three years to acquire darker adult plumage.

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© New Guinea Birds

Source: Birds of Papua New Guinea

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Distribution

Range

New Guinea, Yapen, w Papuan islands and D'Entrecasteaux Arch..

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Distribution:


    New Guinea, except lowlands of Trans-Fly; also West Papuan Is (Salawati, Batanta), Yapen I (in Geelvink Bay) and D'Entrecasteaux Archipelago.


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Source: Birds of Papua New Guinea

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Physical Description

Size

51-56 cm; one bird 635 g

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Source: Birds of Papua New Guinea

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Diagnostic Description

Medium-sized, long-tailed, scruffy crow with stout bill and bare pink facial skin; sparse nasal and rictal bristles. Plumage is variable, blackish to dark brown or grey, with slightly glossy wings and tail; iris light blue; bill grey; legs pink to grey. Sexes similar. Juvenile much paler than adult, pale grey-brown above, whitish on head and below, appearing rather bleached, with brown eyes and white bill; immature is only marginally less pale, with pink bill and feet (birds with mottled grey-brown eyes are probably immature); takes three years to acquire darker adult plumage.

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© New Guinea Birds

Source: Birds of Papua New Guinea

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Ecology

Habitat

Habitat and Ecology

Systems
  • Terrestrial
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Source: IUCN

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Primary rainforest, forest edge, secondary growth, gardens, swamp-forest; lowlands to 1500 m. Sometimes visits open areas and riverbanks or sandbars.

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Source: Birds of Papua New Guinea

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Trophic Strategy

Feeds mainly on fruits in forest canopy; also takes insects, especially when raising young, and sometimes scavenges. Forages often in noisy groups. Gleans in foliage and also on ground.

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Source: Birds of Papua New Guinea

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Life History and Behavior

Reproduction

Poorly known. Apparently breeds through dry season (austral autumn-spring); two nests found in Mar. nestlings in Oct to early Dec. and fledglings in Oct-Nov (including group of five fledglings and five adults in Oct). One nest was a bowl of sticks in outer fork near top of emergent deciduous tree over rainforest, contained four fully grown nestlings, attended apparently by only two adults; one nests in top of tree in primary forest and another high in large forest-edge tree. No information on clutch size; one alleged clutch of 2 eggs not attributable to this species. No other information.

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Source: Birds of Papua New Guinea

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Conservation

Conservation Status

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 a very 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 stable, 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 has not been quantified, but it is not believed to 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.
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Not Threatened

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Source: Birds of Papua New Guinea

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Population

Population
The global population size has not been quantified, but the species is reported to be relatively common (Madge and Burn 1993).

Population Trend
Stable
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Wikipedia

Grey Crow

The Grey Crow (Corvus tristis), formerly known as the Bare-faced Crow, is about the same size (42–45 cm in length) as the Eurasian Carrion Crow (Corvus corone) but has somewhat different proportions and quite atypical feather pigmentation during the juvenile phase for a member of this genus.

The tail feathers are relatively long and graduated and the legs are relatively short. The overall colouring of the adult bird is black with randomly bleached wing and tail feathers. A large region around the eye is quite bare of feathering and shows pinkish-white skin with the eyes a bluish-white. The bill is unusual too in being very variable, bluish on upper mandible and pinkish-white on the lower in some specimens, while on others the whole bill is pinkish white with a darker tip. The forward pointing nasal bristles so often prominent in other Corvus species are very reduced also.

The juvenile bird by comparison has remarkably pale plumage being light brown to cream, the wings, tail and primaries showing blackish-brown and fawn and the head and underparts often almost white.

The species occurs all over the huge island of New Guinea and associated offshore islands in both primary and secondary forest in both lowland and hill forest up to 1350 m.

Feeding is both on the ground and in trees taking a very wide range of items. Fruit seems to be very important making up a large percentage of the intake though small animals such as frogs and aquatic insect larvae are taken from shallow water on sand or shingle beds in rivers. When foraging through the trees the birds keep loose, noisy contact with each other and usually number between 4–8 individuals.

The voice is described as a weak sounding 'ka' or a whining 'caw' with other hoarse sounding notes added when excited.

References[edit]

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