Thick-billed Murres - Oceana Canada

Seabirds

Thick-billed Murres

Uria lomvia

ALSO KNOWN AS

Brünnich’s Guillemont

DISTRIBUTION

Circumpolar, Arctic and Subarctic

ECOSYSTEM/HABITAT

Nest on coastal cliffs; feed in the ocean

FEEDING HABITS

Active (diving) predator

TAXONOMY

Order Charadriiforms (sandpipers, plovers, gulls, auks); Family Alcidae (auks)

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Thick-billed murres are a marine bird and the largest living member of the auk family. One of the most common Arctic bird species, these murres are deep-diving predators and regularly dive to depths of 100 metres in pursuit of prey such as fish, squid, crustaceans, polychaetes and molluscs. Incredibly, they are capable of diving deeper than 200 metres and staying submerged for more than three minutes! Thick-billed murres live in large groups called colonies, which sometimes can reach sizes of more than one million adult birds. They can be found in these dense aggregations during the breeding season on coastal cliffs. In Canada, populations of thick-billed murres can be found in British Columbia, Hudson’s Bay and all along the east coast.

 

Thick-billed murres are the largest living species of the auk family. In general, auks are known for their ability to “fly” better underwater than in the air. When underwater, they flap their wings to propel themselves through the ocean and use their feet as rudders to steer. The top of adult thick-billed murres are black along with their tail, head, legs, and feet, while their undersides are white or grey. Hatchlings are downy-grey or brown, with slightly lighter underside. Both sexes have the same colouration.