Dunlin

The dunlin (Calidris alpina) is a small wader, sometimes separated with the other “stints” in Erolia. The English name is a dialect form of “dunling”, first recorded in 1531–2. It derives from dun, “dull brown”, with the suffix -ling, meaning a person or thing with the given quality.[2] The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds. The specific alpina is from Latin and means “of high mountains”, in this case referring to the Alps.[3]

It is a circumpolar breeder in Arctic or subarctic regions. Birds that breed in northern Europe and Asia are long-distance migrants, wintering south to Africa, southeast Asia and the Middle East. Birds that breed in Alaska and the Canadian Arctic migrate short distances to the Pacific and Atlantic coasts of North America, although those nesting in northern Alaska overwinter in Asia. Many dunlins winter along the Iberian south coast.

An adult dunlin in breeding plumage shows the distinctive black belly which no other similar-sized wader possesses. The winter dunlin is basically grey above and white below. Juveniles are brown above with two whitish “V” shapes on the back. They usually have black marks on the flanks or belly and show a strong white wingbar in flight.

The legs and slightly decurved bill are black. There are a number of subspecies differing mainly in the extent of rufous colouration in the breeding plumage and the bill length. Bill length varies between sexes, the females having longer bills than the males.

On the tip of the Dunlin’s bill is a soft covering that fills with blood and with many nerve endings, forming a sensitive probe that is used to locate invertebrate prey in mud and sand. Although the bill can look sharp-pointed in dead specimens, in life it is blunt.[5]