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Polar Bear or oshkuy Nanook, Umka a carnivorous mammal of the family bear a close relative of the brown. The largest land predator of the planet.
Initially it was assumed that the polar bear was separated from brown around 45-150 million years ago probably in modern-day Ireland. However a recent study showed that was separated from their common ancestor with brown 338-934 thousand years ago and 100-120 thousand years ago as a result of cross-breeding of species representatives took their hybridization with the result that all modern they are the descendants of these hybrids.
Hybridization white and brown bears occurred over an extended period resulting in 2% is detected in a population of genetic material brown. White and brown bears produce fertile offspring so that they are genetically similar. However they can not long survive in the ecological niches of each other have different morphology metabolism social behavior diet and other phenotypic features which allows to classify them as different species.
Lives on drifting and land-fast sea ice which hunts for its main prey: ringed seal bearded seal walrus and other marine animals. He catches them sneaking up from behind cover or near the hole the animal should stick his head out of the water like a bear paw stun prey and pulls it on the ice. Sometimes the bottom tilts floe on which there are the seals. With walrus can handle only on land. In the first place it consumes skin and fat the rest of the carcass only in case of severe hunger. Production Remains eats foxes. When the case picks up carrion dead fish eggs and chicks can eat grass and seaweed in populated areas feeds on trash. There have been cases of robbery it stores food of expeditions. From the extraction the receives a large amount of vitamin A which accumulates in his liver.
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