The polar bears feeds almost exclusively on marine mammals, especially seals, with it's favourite being the ringed seal, but he wouldn't say no to a bearded seal. Polar bears usually catch their prey when seals surface to breathe at breathing holes. In Autumn, a seal creates 10 to 15 breathing holes in the ice using its sharp claws on its foreflippers. Polar bears using their powerful sense of smell, find these holes. They sometimes have to wait days on end for a seal to surface. Once they do come up, the bear will spring and sink its jagged teeth into the seal's head. Bears also stalk ringed seals that are lying on the ice by benefitting from their sleep-wake rhythms. The bear inches slowly forward crawling as it goes and stops in its place when the seal looks up. At about 20 feet from the seal, the bear pounces killing the seal instantly, before it has time to escape back into the sea. Polar bears will also hunt by swimming beneath the ice.
Other food sources are walrus, birds, berries and plants, as well as non living matter, beluga and bowhead whale carcasses and other scavenged material, even seaweed.
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