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A single orca can only kill a young blue whale. However a whole group of orcas can kill an adult blue whale though it would take a long time. An adult blue whale can kill an orca with a single strike of their tail.

Now, the blue whale's only predator is the orca, or killer whale (actually a type of dolphin). Almost a quarter of blue whales have scars from orca attacks, but the blue whale's size (up to 120 tonnes and 60 metres [200 ft] long, bigger than any of the dinosaurs) suggests they are difficult to kill. There is no information on how many are killed by orcas.

A blue whale has been attacked by orcas although the orcas were unable to kill the animal outright during their attack, the blue whale sustained massive wounds and probably died as a result of them shortly after the attack.

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13y ago

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