问世是什么意思Nicobar pigeon
Caloenas nicobarica
Fact Sheet
Status: Lower Risk
Distribution: South Asia, Indo-Australian region, Nicobar Island
Habitat: Small wooded islands
Diet: hard eds, fruit and some invertebrates
Length: 16 inches
Weight: 460-600 grams
Reproduction: They nest in large colonies. Nests are a built in trees or bushes. The female will lay only a single egg.
midwayLongevity: [Nothing determinable]
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General Description: Metallic green and coppery reflections with long hackles on the neck. The head, upper neck flight feathers and breast are dark slate black. The undercoat is pure white and its tail feathers are short. Their bill is a strong hooked bill and large purplish red feet with yellow talons. Has a very muscular gizzard.
Behavior: The nicobar pigeon is nomadic, traveling from island to island in flocks of eighty or more birds in arch of food. It spends daylight hours on the ground and feeding off the forest floor. It us its beak to dig in the earth for food. It flies very low to the ground.
Did you know: The nicobar pigeon will roost and breed on an island that is not inhabited by humans, but it will fly to larger island to feed.nel
Where can you find them? In zoos, and in their natural habitat
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Nicobar Pigeon
The Nicobar Pigeon also known as the "hackled pigeon," "white-tailed pigeon" or vulturine pigeon" is one of the most beautiful of the pigeon/dove species. They are rather thick t with a relatively small head, but long legs and wings. They are heavier than most pigeons there size, they can be up to 32-35cm (16 in), the male being 460-525g and the female 490-600g. The pigeon is stocky and dark, it is metallic green with coppery reflections with unique long fowl like hackles on the neck. The head, upper neck flight feathers and breast are dark slate blackish gray with a silvery purplish bloom. The tail of this pigeon is very short with a pure white undercoat. On the ba of the bill near the forehead, there is a black knob that is larger in the males. They have a strong, hooked bill and large purplish red feet with buffy yellow claws. The females are similar, but they are smaller with shorter hackles and browner underparts.
The Nicobar is nomadic, they commute from island to island in flocks up to 85 birds at a height of 60m or more during the day to find food (hard eds, fruits, incts, and corn). Tthey feed off of the ground, toss leaves aside and dig with their bill. The pigeons roost together at night on islands tha
t are not inhabited. The Nicobar does not sip when drinking, instead they are like other pigeons and doves, they immer their bill sucking up the water. The Nicobar is usually silent, but their vocalization is a deep cooing sound. The breeding ason for the pigeons emed to be prolonged, but the birds are monogamous and tend to mate for a life time. It ems as if the male bows to the female and coos loudly, this action can go on for days. This is followed by the building of the nest. The male provides the nesting site which is normally in thick brushy areas, also they gather 3-4 twigs, roots and other material needed to build the nest. The female arranges the twigs so that the egg would be stable and not roll. Their nest can be as low as 2m above the ground in undisturbed colonies, or just below the canopy top to 12m in disturbed sites. In each clutch, there is 1 egg (there can usually be 2 eggs) elliptical in shape and white, with a faint bluish tinge. Both the male and the female share the incubating duties which last 30 days (two and a half weeks for each parent). The birds are hatched nearly naked, with shiny black skin. When born, the birds are helpless, and require attentive parental care and feeding. They are first fed "crop milk" which is a rich fluid regurgitated by the female parent. Gradually the birds switch to a solid diet of fruit and ed. The parents try to keep their young as warm as possible, until their feathers begin to grow (about 10 days). Within less than a month the young pigeons can fend for themlves even though they remain in their nest.
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Special anatomical, physiological
北洋燕园
or behavioral adaptations:
Some special behavioral adaptations of the Nicobar pigeon is its very thick walled muscular gizzard, which is lined with plates. This muscular gizzard enables them to grind large hard nuts that a human could only open with a hammer. They commute to safe localities in large flocks between their foraging
and breeding islands(only breed on islands that are not inhabited). They make a sound like pigs grunting when threatening others. They fly clo to ground level. They also immer their bill to suck up the water instead of sipping.
From: www.whozoo/Intro2000/jiamcamp/jc_nicobar_pigeon.htm
