Big Brown Bear

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Phylogeography and mitochondrial diversity of extirpated brown bear ( Ursus arctos) populations in the contiguous United States and Mexico". The history of the bears of the Alexander Archipelago is unusual in that these island populations carry polar bear DNA, presumably originating from a population of polar bears that was left behind at the end of the Pleistocene, but have since been connected with adjacent mainland populations through movement of males, to the point where their nuclear genomes are now more than 90% of brown bear ancestry. Brown bears play important roles as predators—keeping animal populations in check—and as seed dispersers. In Scandinavia, there are only four known cases since 1902 of bear encounters which have resulted in death.

Big Brown Bear

Studies have shown that activity throughout the range can occur at nearly any time of night or day, with bears who dwell in areas with more extensive human contact being more likely to be fully nocturnal.Being serially monogamous, brown bears remain with the same mate from a couple of days to a couple of weeks. failed verification] Most attacks occur in the months of July, August and September, the time when the number of outdoor recreationalists, such as hikers or hunters, is higher.

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However, recent DNA analysis has identified as few as five main clades which contain all extant brown bears, [31] [32] while a 2017 phylogenetic study revealed nine clades, including one representing polar bears. A report from 1973 describes twelve known cases of brown bears killing tigers, including adult males.Brown bears have very large and curved claws, those present on the forelimbs being longer than those on the hind limbs. Both the "jaw gape face" and the "biting face" are made in aggression and bears switch between them. Interior brown bears are generally smaller than is often perceived, being around the same weight as an average lion, at an estimate average of 180kg (400lb) in males and 135kg (298lb) in females, whereas adults of the coastal populations weigh about twice as much. They tend to dominate polar bears in disputes over carcasses, [163] and dead polar bear cubs have been found in brown bear dens.