How big is an orca whale?

Orcas, or killer whales, are the largest of the dolphins and one of the world's most powerful predators. They feast on marine mammals such as seals, sea lions, and even whales, employing teeth that can be four inches long. read more

The killer whale or orca (Orcinus orca) is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member. Killer whales have a diverse diet, although individual populations often specialize in particular types of prey. read more

The orca whale's large size and strength make it among the fastest marine mammals, able to reach speeds in excess of 30 knots (about 34 mph, or 56 kph). Credit: Orca image via Shutterstock Orcas are often called killer whales. read more