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The thick-billed murre or Brünnich's guillemot (Uria lomvia) is a bird in the auk family (Alcidae). This bird is named after the Danish zoologist Morten Thrane Brünnich.The very deeply black North Pacific subspecies Uria lomvia arra is also called Pallas' murre after its describer.
Annual survival probability for birds aged 6–15 is 0.895, [34] and average lifespan is about 20 years. Breeding success increases with age up to age 9–10 to 0.7 fledglings per pair, then declines in the oldest age birds, perhaps indicating reproductive senescence. [34] High densities mean that birds are close contact with neighbouring ...
Lagopus muta pyrenaica – MHNT. The rock ptarmigan (Lagopus muta) is a medium-sized game bird in the grouse family.It is known simply as the ptarmigan in Europe. It is the official bird for the Canadian territory of Nunavut, [4] where it is known as the aqiggiq (ᐊᕿᒡᒋᖅ), and the official game bird for the province of Newfoundland and Labrador. [5]
Early movement between the Pacific and the Atlantic probably happened to the south (since no northern opening to the Atlantic existed), with later movements across the Arctic Ocean. [10] The flightless subfamily Mancallinae , which was apparently restricted to the Pacific Coast of southern North America and became extinct in the Early ...
The northern fulmar (Fulmarus glacialis), fulmar, [2] or Arctic fulmar [3] is an abundant seabird found primarily in subarctic regions of the North Atlantic and North Pacific oceans. There has been one confirmed sighting in the Southern Hemisphere , with a single bird seen south of New Zealand . [ 4 ]
A high-latitude species, the gyrfalcon breeds on the Arctic coasts and tundra, the islands of northern North America and the Eurosiberian region, where it is mainly a resident species. Some gyrfalcons disperse more widely after the breeding season or in winter, and individual vagrancy can take birds for long distances. Its plumage varies with ...
The birds follow a somewhat convoluted course in order to take advantage of prevailing winds. [15] The average Arctic tern lives about 30 years and will, based on the above research, travel some 2.4 million km (1.5 million mi) during its lifetime, the equivalent of a roundtrip from Earth to the Moon more than three times. [16]
These birds forage for food like other auks by swimming underwater. They mainly eat crustaceans , especially copepods , of which a 150 g (5.3 oz) bird requires ~60,000 individuals per day (equivalent to 30 g [1.1 oz] of dry food weight), [ 19 ] but they also eat small invertebrates such as mollusks , as well as small fish.