Torresian Imperial-Pigeon
Ducula spilorrhoa
Large, predominantly white pigeon with black wing feathers. Tip of the tail also black. Feeds on fruits, known to roost on islands and in mangroves. Forms large flocks.
识别特征
The Torresian imperial pigeon is a large plump pigeon, 38-44 centimetres (15-17.5 inches) in length, and with a 45 cm (18 in) wingspan. It is entirely white or pale cream, apart from the black flight feathers (remiges), part of the tail (rectrices) and spots on the undertail coverts. The head can be brown, soiled by eating fruit.
分类信息
Its taxonomy is confusing and remains unsettled. It has sometimes been considered a subspecies of the pied imperial pigeon. When recognized as a separate species, the number of subspecies of the Torresian imperial pigeon also remains unsettled. Many recognize two: The widespread D. s. spilorrhoa (nominate) and D. s. constans of the Kimberleys. However, the latter is sometimes considered a junior synonym of former. Alternatively, it has been argued that it should be considered a separate species, the Kimberley imperial-pigeon (D. constans Bruce, 1989).<p>Two additional taxa, subflavescens of the Bismarck Archipelago and melanura of the Moluccas, have been associated with the Torresian imperial pigeon. The former has a distinctive yellowish-tinged plumage and a bluish basal half of the bill, and is increasingly treated as a separate species, the yellowish imperial pigeon (D. subflavescens). Most recent authorities place melanura under the pied imperial pigeon, but it has black spotting to the undertail coverts and a greenish-yellow bill similar to the Torresian imperial pigeon. However, melanura also has a significantly broader black tail-tip than the Torresian imperial pigeon.
- 学名
- Ducula spilorrhoa
- 命名信息
- (Gray, GR, 1858)
- 目
- Columbiformes
- 科
- Columbidae
- 属
- Ducula
分布与栖息地
- 迁徙
- Complete migrants
行为
The flight of the pigeon is fast and direct, with the regular beats and an occasional sharp flick of the wings which are characteristic of pigeons in general.<p>The male displays by flying up steeply, pausing, tipping forward and then gliding downwards. The female builds an untidy stick nest in a tree, usually a coconut palm and lays a single white egg, which hatches within 26 to 28 days. The squab fledges after another three weeks. In Australia they breed between August and January in mangroves, vines, palm fronds on off-shore islands, such as the Brook Islands. In north-east Queensland, they migrate daily as flocks from the islands to the mainland rainforests to eat fruit, returning to the islands at dusk.<p>This is an arboreal dove, feeding almost exclusively on fruit. It can swallow fruits with very large seeds, the latter being regurgitated or excreted whole, depending on size, after the pulp has been removed.<p>Calls made by the birds are a deep "mrrrooooo", "roo-ca-hoo" and "up-ooooo".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Tinian Monarch
Monarcha takatsukasae
Mostly rusty-red below and around the face, with a gray cap and a brownish back. Tail black with white tips, and wings have clear white double wingbars. Undertail white. Found in any forested habitat and dense scrub. Song is a short whistled “tee-tee-wheeeooo.” Common calls include mostly low rasping and scolding.
Tawny Eagle
Aquila rapax
A medium-large, highly variable eagle that can range in overall color from whitish or creamy dull rufous to grayish-brown, and rarely dark brown. It has a moderately long gape line that stops at the center of the eye and slit-shaped nostrils. Legs are short and heavily feathered, with baggy “trousers.” Juveniles are generally paler than adults, while older immatures can have a dark hood and pale body. Mostly a bird of plains and open scrub; rarely seen over water, and avoids forests. Overall not as heavy looking as the Steppe Eagle, and never has a rich brown color tone.
Buff-throated Warbling Finch
Microspingus lateralis
Medium-sized gray and orange finch from montane forests, including Araucaria forests. Note the black and pale eyebrow. Gray above with a buff throat and breast turning cinnamon on the sides with a white patch on the center of the belly. The call is a fast monotonous repetition of “tseep” notes.
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