Eastern Cattle-Egret
Ardea coromanda
Small, compact white heron with relatively short yellow bill. More often seen in dry habitats than other egrets, but also frequent in rice paddies and shallow wetlands. In the breeding season, look for bright orange head and breast, as well as a brighter bill. Leg color varies from reddish or yellow during the breeding season to black during the nonbreeding season. Juveniles have dark bill. Always note relatively short, thick neck and short legs compared with other egrets. Often gathers in flocks, frequently following large animals and field machinery.
识别特征
The cattle egret is a stocky heron with an 88–96 cm (35–38 in) wingspan; it is 46–56 cm (18–22 in) long and weighs 270–512 g (9.5–18.1 oz). It has a relatively short thick neck, a sturdy bill, and a hunched posture. The non-breeding adult has mainly white plumage, a yellow bill and greyish-yellow legs.<p>The eastern cattle egret differs from the western species in breeding plumage, when the buff colour on its head extends to the cheeks and throat, and the plumes are more golden in colour. The bill and tarsus are longer on average. It is also smaller and shorter-winged. It has white cheeks and throat, but the nuptial plumes are golden. The positioning of the egret's eyes allows for binocular vision during feeding, and physiological studies suggest that the species may be capable of crepuscular or nocturnal activity. Adapted to foraging on land, they have lost the ability possessed by their wetland relatives to accurately correct for light refraction by water.<p>This species gives a quiet, throaty rick-rack call at the breeding colony, but is otherwise largely silent.
分类信息
Its genus name Bubulcus is Latin for herdsman, referring, like the English name, to this species' association with cattle. <p>The eastern cattle egret, described by Pieter Boddaert in 1783, breeds in eastern and southern Asia and Australasia.<p>Despite superficial similarities in appearance, the cattle egret is more closely related to the genus Ardea, which comprises the great or typical herons and the great egret (A. alba), than to the majority of species termed egrets in the genus Egretta.
- 学名
- Ardea coromanda
- 命名信息
- (Boddaert, 1783)
- 目
- Pelecaniformes
- 科
- Ardeidae
- 属
- Ardea
分布与栖息地
In Australia, colonisation began in the 1940s, with the species establishing itself in the north and east of the continent. It began to regularly visit New Zealand in the 1960s.<p>The expansion of the eastern cattle egret's range is due to its relationship with humans and their domesticated animals. Originally adapted to a commensal relationship with large grazing and browsing animals, it was easily able to switch to domesticated cattle and horses. As the keeping of livestock spread throughout the world, the cattle egret was able to occupy otherwise empty niches. Many populations of cattle egrets are highly migratory and dispersive, and this has helped the species' range expansion.<p>Although the cattle egret sometimes feeds in shallow water, unlike most herons it is typically found in fields and dry grassy habitats, reflecting its greater dietary reliance on terrestrial insects rather than aquatic prey.
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其他鸟类
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Barred Puffbird
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Columba albinucha
A dark maroon-gray pigeon with a hind-crown and nape that are white in the male and gray in the female. At close quarters the bill can be seen to have a black base with a red-yellow tip, and the legs are reddish-purple. In flight the tail has pale-tipped corners. A scarce and localized resident found in pairs in the canopy of lowland and sub-montane forest in isolated populations in the Albertine Rift and Cameroon. Vocalizations are poorly documented, but reputed to be similar to those of Rameron Pigeon, which is larger than White-naped with a yellow eye-ring, bill, and feet, white speckling on the wings, and no white on the head.
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