Pallas's gull
From Kazakhstan Encyclopedia
The Pallas's gull or great black-headed gull (Ichthyaetus ichthyaetus) is a large gull. As is the case with many gulls, it has traditionally been placed in the genus Larus.[1] The scientific name is from Ancient Greek. Ichthyaetus is from ikhthus, "fish", and aetos, "eagle".[2]
Distribution
This species breeds in colonies in marshes and islands from southern Russia to Mongolia. It is migratory, wintering in the eastern Mediterranean, Arabia and India. This gull nests on the ground, laying between two and four eggs.
It occurs in western Europe only as a rare vagrant. In Great Britain a recent review left a single occurrence in 1859 as the only acceptable record of this bird. The species also occurs as a vagrant in differing parts of the Indian Ocean, south of its normal range, and along the northern and eastern coasts of Africa, where it visits annually on an irregular basis.[3]
Description
This is a very large gull, being easily the world's largest black-headed gull and the third largest species of gull in the world, after the great black-backed gull and the glaucous gull. It measures Template:Convert in length with a Template:Convert wingspan.[4][5][6] Weight can vary from Template:Convert, with an average of Template:Convert in males and Template:Convert in females.[7] Among standard measurements, the wing chord is Template:Convert, the bill is Template:Convert and the tarsus is Template:Convert.[5] Summer adults are unmistakable, since no other gull of this size has a black hood. The adults have grey wings and back, with conspicuous white "mirrors" at the wing tips. The legs are yellow and the bill is orangey-yellow with a red tip.
In all other plumages, a dark mask through the eye indicates the vestiges of the hood. The call is a deep aargh cry. Young birds attain largely grey upperparts quite rapidly, but they take four years to reach maturity.
Ecology
This bird has a deep, rather nasal flight-call which resembles the call of the lesser black-backed gull. Although they are noisy at colonies, Pallas's gulls are mostly silent when breeding.
These birds are predatory, taking fish, crustaceans, insects and even small mammals.
The Pallas's gull is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
Gallery
- Pallas's Gull (Larus ichthyaetus) W IMG 6954.jpg
In flight Krishna Wildlife Sanctuary, Andhra Pradesh, India.
- Larus ichtyaetus 3.png
Adult with chick, Manych River, Kalmykia, Russia.
References
External links
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