Micronesian Imperial-Pigeon
Ducula oceanica
A large pigeon with a mostly gray body, green wings, and a distinctive and diagnostic black fleshy knob above the bill. Found across most habitats, but most common in undisturbed forest. Voice is a series of raspy growling notes becoming gradually shorter, “grroww… grroww grow grow-gr-gr.”
识别特征
The Micronesian imperial pigeon is about 36 cm (14 in) long and weighs 340–406 g (12.0–14.3 oz). The head and neck are ashy grey. The back and wing coverts are dark green, reflecting dark blue. The flight feathers are blackish, with a green gloss. The breast is light grey, and the vent is dark rufous. The tail is blackish above and dark brown below. The beak is slaty black, and the cere is black. The eyes are reddish brown, and the feet are purplish red. The female and the juvenile birds are darker. The subspecies are distinguished by their size and the colour of their heads.This species of bird makes many different types of calls, which can sound like barking, cooing, or moaning. It can probably fly pretty well.
分类信息
The species was first described as Columba oceanica in 1826. The binomial authority was formerly considered to be Lesson & Garnot, but it is now given as Desmarest. Five subspecies are recognized: D. o. monacha in Palau and Yap, D. o. teraokai on Chuuk, D. o. townsendi on Pohnpei, D. o. oceanica on Kosrae, and D. o. ratakensis in the Marshall Islands.
- 学名
- Ducula oceanica
- 命名信息
- (Desmarest, 1826)
- 目
- Columbiformes
- 科
- Columbidae
- 属
- Ducula
分布与栖息地
The Micronesian imperial pigeon is found in the Marshall Islands, Yap, Chuuk, Pohnpei and Kosrae of Micronesia, Nauru, Kiribati and Palau. The populations on many of the Marshall Islands are probably extinct. On Pohnpei and Kosrae, it mostly lives in the mountains. In areas where it is not hunted, it is found in secondary forest, forest on beaches, and mangroves. It also occurs in coconut plantations.<p>The species also occurred once in the Mariana Islands, where Holocene subfossil remains are found.
- 迁徙
- Resident species
行为
This pigeon is mostly solitary, usually observed in the canopy. It eats fruits and fleshy seeds. Its calls include a deep-throated bark grrow-row-row-ow, a moan, and mellow coos. Almost nothing is known about its breeding. The breeding season is probably the entire year.
保护状况
- 种群趋势
- declining
照片
分布
其他鸟类
Red-necked Crake
Rallina tricolor
Secretive crake of rainforest habitats where there is thick cover alongside a stream or pool. Usually shy, but patient observation at dusk may reward viewers with a sighting. Adult dark olive-brown with rich chestnut head and chest, greenish-yellow bill, black-and-white banded undertail, and red legs. Juvenile mostly dusky. Gives an accelerating sequence of short repeated squawks and squeaks, as well as slower clicks.
Scaly Chatterer
Argya aylmeri
An unusual slim babbler with a very long tail. Paler than most other babblers in range, gray-brown overall with scaling on the breast, a yellowish bill, and pale blue bare skin around the eye. Found in areas of dense undergrowth within dry thorn savanna and thorn scrub, almost always in small groups. Somewhat similar to other babblers, especially Rufous Chatterer, but much paler and generally found in drier habitat. An inconspicuous and skulking bird that is usually detected by call: quiet, high-pitched “tsit” notes that sound like a dry twig scraping on a windowpane.
Australian Magpie
Gymnorhina tibicen
Large black-and-white bird with long, pale bill with dark tip. Larger than butcherbirds and differently patterned. Black head, face, underparts, white nape, upperwing coverts, and rump, and either black or white back (subspecies vary in plumage). Widespread in farmland, parks, and open woodlands, where usually seen in pairs or groups strutting on the ground. Song a memorable fluty warble.
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