Polar bear diet   Polar bears are carnivores and their diet consists mainly of seals. They primarily hunt ringed seals and bearded seals, although they will also feed on other marine mammals, such as walruses and beluga whales, when food is scarce.   During the winter, when the sea ice is solid, polar bears will hunt seals by waiting at breathing holes in the ice, where seals come up to the surface to breathe.