Polar Bear: Ursus maritimus

摘要: Publisher Summary The polar bear is, on average, the largest of eight species bears found worldwide and is completely white. Ecologically, it only marine bear. Typically, body stocky, lacks a shoulder hump, has longer neck in relation to rest than other ursids. Polar are thought have originated from brown bears, 1.3 million years ago. capable interbreeding zoos young fertile. Although wild, there little overlap habitats during breeding season, been one confirmed. distributed ice-covered waters throughout circumpolar Arctic. small numbers animals may be permanent multiyear pack ice central arctic basin, their preferred habitat annual over continental shelves continents islands around coastline Arctic Ocean where overall biological productivity densities ringed seals, primary prey, greatest. Regional concentrations seasonal movement patterns influenced primarily by type distribution sea density seals. that continuous access continue hunt year. Their hunting methods rates success change with seasons vary different areas. most common method lie beside breathing hole waiting for seal surface breathe. remarkable ability store large amounts fat periods when mainly available then fast protracted food not available.