Terek Sandpiper

The Terek sandpiper is slightly larger than the common sandpiper, 22–25 centimetres long, and its long upcurved bill, somewhat like an avocet's but less strongly curved, makes it very distinctive. As its scientific name implies, it has a grey back, face and breast in all plumages, with a white supercilium that may be more or less distinct. The belly is whitish and the feet yellow; the bill has a yellowish base and is otherwise black. The call is a high whistle. (Wikipedia, general species account)

It breeds near water in the taiga from Finland through northern Siberia to the Kolyma River and migrates south in winter to tropical coasts in east Africa, south Asia and Australia, usually preferring muddy areas. It is named after the Terek River, which flows into the western Caspian Sea, where it was first observed. It is a rare vagrant in western Europe, and almost annually a few birds stray to Alaska and the Aleutian and Pribilof Islands. (Wikipedia, general species account)