Killer whales are a species of oceanic dolphin which (surprisingly) eat other dolphin species.They are the biggest type of dolphins. They are also called Orcas. Their diet further consists of sharks, seals and fish. They are known to play with their food before eating it. They are called "Wolves of the ocean", because they hunt tactically as pack like wolves. They are very social animals, with packs (collective noun for killer whales) ranging up to ten or twenty. They catch their prey using echolocation. They are mammals and cannot breath under water, so they hold their breath while diving. Though they breath when they reach surface, they cannot stay out of water for more than ten minutes. That is because their skin needs to be constantly wet. They are very intelligent animals. While catching seals on icebergs, they tip the iceberg over so that the seals fall into the ocean. They can also be trained to do tricks.
Check out this video on killer whales
Now a picture
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