What eats walruses?

Answer 1

Due to its sheer size and weight, there are only two known natural predators to adult Walruses. The Orca or Killer Whale and the Polar Bear. Even these predators aren't known to hunt on adults due to the danger of being hurt by their tusks. They prefer the Walrus calves as they are easier to hunt and less dangerous. Young ones that get crushed or wounded in a stampede are the easiest targets for the predators.

Apart from these natural predators, Man is the biggest hunter of Walruses. For centuries, the humans living in the Arctic regions have hunted & consumed Walrus Meat.