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Caspian Tern

Hydroprogne caspia (Pallas, 1770)

Крячок каспійський | Чеграва

2015-09-08
Koblevo
© Yuriy Kodrul

Description

Caspian Tern is the largest of terns in Kazakhstan. It is 6-7 times heavier than Common Tern. In comparison to Gulls it is larger than Black-headed and Common Gulls and some lesser than Caspian Gull. The adult Caspian Terns in breeding plumage have black crown and nape; feathers of nape are long and form small crest. Back is bluish-grey, uppertail and tail feathers are lighter than back, almost white. Bill is large, red; legs are black with orange soles. Eyes are dark-brown. In winter plumage adult birds have white crown with black longitudinal streaks; fore-head have black spots too. Juvenile birds have white crown with brownish longitudinal streaks and spots. feathers on the back are grey with buffy edges and brownish little arrow-shaped spots. Tail feathers have brownish terminal spots and buffy tips. Bill is orange, legs are black. Sizes: wing 380 – 400 mm, tarsus 40 -47 mm, bill 60 – 75 mm. Weight: 500 – 700 grams.

References

"Птицы Казахстана" том 2. Алма-Ата, 1962.

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