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The genetic similarities between polar bears and some brown bears were found to be the result of interbreeding. [23] [24] A 2012 study estimated the split between polar and brown bears as occurring around 600,000 years ago. [23] A 2022 study estimated the divergence as occurring even earlier at over one million years ago. [24]
The ulna is estimated to have been 48.5 cm (19 in) long when complete- for comparison, modern subadult polar bear ulnae are 36–43 cm (14–17 in) long. [1] The ulna was dated to the early Weichselian of the Late Pleistocene (~70kya). [2] Of the 16 specimens identified as Pleistocene polar bears, this is the only fossil ascribed to this ...
The protozoan Toxoplasma gondii has been found in polar bears, and the nematode Trichinella nativa can cause a serious infection and decline in older polar bears. [118] Bears in North America are sometimes infected by a Morbillivirus similar to the canine distemper virus. [119]
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[3] [5] Old Martin was not the first bear to have lived at the Tower of London because in 1251 Henry III had been given a polar bear by the king of Norway, Haakon the Young. [5] In 1999 Old Martin's skin and feet were found at the Natural History Museum, London, catalogued as a "black bear", and were returned to the Tower for a special ...
USA, Wales, Alaska — Myomick was attacked and killed by a polar bear in the small village of Wales, Alaska. The attack happened at 2:30 pm. The polar bear had chased several residents of the community, before it killed the woman and her 1-year-old son. The bear was shot and killed by a local resident as it attacked the pair. [46] [47]
There are 20 known sub-populations of polar bears across the Arctic. This is one of the most southerly and best studied. "They're our fat, white, hairy canaries in the coal mine," Alyssa explains.
With the polar bear species in a fight for survival because of disappearing Arctic sea ice, a new distinct group of Greenland bears seem to have stumbled on an icy oasis that might allow a small ...