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Polar bear. The polar bear (Ursus maritimus) is a large bear native to the Arctic and nearby areas. It is closely related to the brown bear, and the two species can interbreed. The polar bear is the largest extant species of bear and land carnivore, with adult males weighing 300–800 kg (660–1,760 lb). The species is sexually dimorphic, as ...
A polar bear scavenging a narwhal carcass. Age determination techniques using the number of periosteum layers in the lower jaw reveal that narwhals live an average of 50 years, though techniques using amino acid dating from the lens of the eyes suggest that female narwhals can reach 115 ± 10 years and male narwhals can live to 84 ± 9 years. [74]
Susan J. Crockford. Susan Janet Crockford is a Canadian zoologist and climate change denialist known for her research and publications on polar bears. From 2004 to 2019 she was an adjunct professor in Anthropology at the University of Victoria. [1]
But the lack of consistent estimates of population trends and survival rates for some polar bear subpopulations, which are distributed over a very large geographic area with differences in sea ice ...
Siku was born on 22 November 2011 [2] at Skandinavisk Dyrepark ("Scandinavian Wildlife Park") in Djursland, Denmark. [3] According to the Scandinavian Wildlife Park, The name is symbolic because the polar bears are 100% dependent on sea ice for their survival. Polar bears catch all their prey from the sea ice, so no sea ice – no polar bears.
The key danger for polar bears posed by the effects of climate change is malnutrition or starvation due to habitat loss.Polar bears hunt seals from a platform of sea ice. Rising temperatures cause the sea ice to melt earlier in the year, driving the bears to shore before they have built sufficient fat reserves to survive the period of scarce food in the late summer and early fall.
A grizzly-polar-bear-hybrid (also named grolar bear, pizzly bear, zebra bear, [1][2] polizzy, grizzlar, or nanulak) is a rare ursid hybrid that has occurred both in captivity and in the wild. In 2006, the occurrence of this hybrid in nature was confirmed by testing the DNA of a unique-looking bear who had been shot near Sachs Harbour, Northwest ...
Allen's rule is an ecogeographical rule formulated by Joel Asaph Allen in 1877, [2][3] broadly stating that animals adapted to cold climates have shorter and thicker limbs and bodily appendages than animals adapted to warm climates. More specifically, it states that the body surface-area-to-volume ratio for homeothermic animals varies with the ...