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8 unexpected animals that sing

By: Katherine Butler on May 13, 2011, 10:30 a.m.
killer whales jumping

Photo: Fremlin/Flickr

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Killer whales sing for their peers

Humpbacks aren't the only sea mammals that sing. Killer whales, also known as orcas, are the largest members of the dolphin family, and they employ one of the most sophisticated ultrasonic sound systems as a way of communication. As one resource notes, “Not only do they have regional dialects, which produce slight variations in sound depending on their geographical distribution, but each animal has two distinct call signs.” Their advanced ability to communicate is likely because they're extremely social animals, often travelling in pods of 30 to 150 orcas.