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Black-throated Diver

©Mark Hamblin/2020VISION

Black-throated diver

Enw gwyddonol: Gavia arctica
The streamlined black-throated diver is a superb swimmer and diver, but not so graceful on land! During the summer, the distinctive black patch on its throat appears, heralding the breeding season.

Species information

Category

Ystadegau

Length: 66cm
Wingspan: 1.2m
Weight: 2.3-3.4kg
Average lifespan: 12 years

Statws cadwraethol

Classified in the UK as Amber under the Birds of Conservation Concern 5: the Red List for Birds (2021). Protected in the UK under the Wildlife and Countryside Act, 1981. Priority Species under the UK Post-2010 Biodiversity Framework.

Pryd i'w gweld

January to December

Ynghylch

The black-throated diver is a large waterbird; it is larger than the great crested grebe, but smaller than the cormorant. Black-throated divers nest on small pools and lochs, moving to the coast in winter, where they feed on fish. It sometimes turns up on big lakes and reservoirs.

Sut i'w hadnabod

The black-throated diver looks smart in its summer plumage, with a black throat, silky grey head and neck, and a black-and-white-chequered back. In the winter, it turns a very dark grey above and white below, with an obvious white patch on its rear flanks. It has a straight, dagger-like bill.

Dosbarthiad

Nests in the far north of Scotland. Seen at sea around most coasts in winter.

Habitats

Roeddech chi yn gwybod?

The black-throated diver is known in America as the 'Arctic loon'. It can fish at depths of up to six metres, but usually only stays underwater for a minute or so.