The Black-throated Loon (Gavia arctica) also known as is known as an Arctic Loon in North America and the Black-throated Diver in Eurasia is a migratory aquatic bird. Breeding adults are 58 to 77 cm (23 to 30 in) in length with a 100 to 130 cm (39 to 51 in) wingspan, shaped like a smaller, sleeker version of the Great Northern Diver. Body mass is reportedly from 2-3.4 kg (4.4-7.5 lb).[6] They have a grey head, black throat, white underparts and chequered black-and-white mantle. Non-breeding plumage is drabber with the chin and foreneck white. Its bill is grey or whitish and dagger-shaped. In all plumages a white flank patch distinguishes this species from all other divers including the otherwise almost identical Pacific Diver.


Habitat and Distribution

It breeds in Eurasia and occasionally in western Alaska. It winters at sea, as well as on large lakes over a much wider range. It is a vagrant to Pakistan


Feeding

This species, like all divers, is a specialist fish-eater, catching its prey underwater. It flies with neck outstretched. It feeds on fish, insects, crustaceans and amphibians.


Breeding

The black-throated diver's nest is a heap plant matterial and is located right by water. The female lays one to three olive-brown speckled eggs and both the male and female incubate the eggs.


Calls and Songs

The calls include a yodelling high-pitched wail and harsh growls, similar but lower pitched than Pacific Loon.