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Killer whales are highly social ; some populations are composed of matrilineal family groups (pods) which are the most stable of any animal species.  Their sophisticated hunting techniques and vocal behaviours, which are often specific to a particular group and passed across generations, have been described as manifestations of animal culture . 
Orcas are often called killer whales. Though they don't typically attack humans, this name is still well-chosen due to the animal's ability to take down large marine animals, such as sea lions and whales. In fact, orcas will prey on almost any animal they find in the sea, in the air over the water or along the coastline. To hunt, killer whales use their massive teeth, which can grow up to 4 inches (10 centimeters) long.
With their striking black and white markings and prevalence at marine parks, the killer whale (or, more nicely put, orca) is probably one of the most easily-recognized cetacean species. Here are some fascinating facts about orcas.