Black-throated Diver (Gavia Arctica ) Bird Information
Black-throated Diver intermediate in size between Red-throated and Great Northern Divers. Breeds on larger lakes and winters offshore. In summer, largely black and white with two chequered ovals on back. In black-throated diver, Neck striped black and white with black foreneck. In winter, upperparts plain slate-brown in adult; slightly mottled in juvenile. White patch on rear flanks often obvious. Dark of crown extends below eye giving masked effect.
Status: scarce breeder in the north and west Scotland. Winters along all shores, mostly in the west.
Similar Species: Red-throated Diver always paler and more slightly built. Great Northern Diver has more massive head and bill and black, not grey, head in summer, chequered bach Summer.
Black-throated Diver Bird Facts
|Size||56-69 cm (25 in.)|
|Behaviour||swims, dives from surface, takes off and land on water|
|Flocking||summer solitary; small flocks winter|
|Fight||strong and powerful; direct|
|Voice||grunts, croaks and loud wailing in breeding season|
|Upperparts||black and white, with two chequered ovals|
|Tail||black; short and pointed|
|Bill||black; straight and pointed|
|Ad.winter||dark above, white below, white patch on rear flanks|
|Juvenile||as Ad.winter, speckly above|
|Nest||scrape at water’s edge|
|Egg||2; olive-brown, blotched black|
|Population||150 pairs; 1300 winter|