Also known as orcas, killer whales are not really whales at all. Killer whales are members of the dolphin family known as Cetacea. Considered the largest of all dolphins, killer whales are known to feed many types of marine life, including sea lions, seals and whales. Seabirds, squid and various types of fish also are parts of the orca’s diet. The teeth of the killer whale are 4 inches (10 cm) long and sharp enough to grab onto prey so that the orca can drag it into deeper water.
More facts about killer whales: