Feeding
Killer whales are without a doubt top predators in the ocean. In fact, they are the largest predator of warm-blooded animals ever known. Fishes, squids, seals, sea lions, walruses, birds, sea turtles, otters, penguins, polar bears, reptiles, and even a moose have all been found in the stomach contents of killer whales. The most interesting thing found in the stomachs of killer whales is the remains of other killer whales. How this came to be is uncertain as killer whale predation on other killer whales is rare. Perhaps they scavenged the remains of dead killer whales, as killer whales are known to eat the remains of other animals. The diets of killer whales vary from one region to another; In the Antarctic, killer whales eat about 67% fishes, 27% marine mammals, and 6% squids. In the Bering Sea near Alaska, they eat about 65% fishes, 20% squids, and 15% marine mammals, the diets of resident and transient killer whales differ as well.