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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).
Polar bears might be greasier than widely believed.. The bears’ greasy fur is the secret to the popular species’ survival in one of Earth’s most punishing climates. The grease, also known as ...
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.
Susan Janet Crockford is a Canadian zoologist 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] Crockford has gained attention for her blog posts on polar bear biology, in which she argues that polar bears are not threatened by climate change ...
Baculum of a dog's penis; the arrow shows the urethral sulcus, which is the groove in which the urethra lies. Fossil baculum of a bear from the Miocene. The baculum (pl.: bacula), also known as the penis bone, penile bone, os penis, os genitale, [1] or os priapi, [2] is a bone in the penis of many placental mammals.
The Polar Bear Family & Me is a three-part nature documentary series produced by the BBC Natural History Unit. It follows wildlife cameraman Gordon Buchanan as he spends a year with a family of wild polar bears, under the guidance of his biologist Jason Roberts, the polar expertise of the Antarctic region and Svalbard near Norwegian archipelago of the Arctic Ocean.
Fibrolamellar bone is fairly common in young crocodilians and sometimes found in adults. [68] [69] Haversian bone has been found in turtles, crocodilians and tortoises, [70] but is often absent in small birds, bats, shrews and rodents. [69] Nevertheless, de Ricqlès persevered with studies of the bone structure of dinosaurs and archosaurs.
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