PREY: The orca is at the top of the marine food web. Their diet items include fish, squid, seals, sea lions, walruses, birds, sea turtles, otters, other whales and dolphins, polar bears and reptiles. They even have been seen killing and eating swimming moose. ... Humans are the only significant predators of orcas.

What eats a moose?

Bears and wolves prey on moose. Black and grizzly bears have been known to prey heavily on moose calves during the first few weeks of life, and grizzly bears can easily kill adult moose. Throughout most wolf range in Canada, moose are the principal prey of wolves. Wolves kill many calves and take adult moose all year.

What eats an orca?

Killer whales are apex predators, which means they have no natural predators. They hunt in packs, much like wolves, which are also at the top of their food chain.