The pygmy killer whale (Feresa attenuata) is a small, rarely seen cetacean of the oceanic dolphin family (Delphinidae). It derives its common name from sharing some physical characteristics with the killer whale. It is the smallest species that has "whale" in its common name. In fact, "killer" may be more apt in the case of the pygmy killer whale than its larger cousin; when a number of pygmy killers were brought into captivity in Hawaii and South Africa they were extremely aggressive—even killing other poolmates. A pod captured in Japan did not display such aggression.
Although it had been described by John Gray in 1874, until the early 1950s the pygmy killer whale was known only from two skulls kept at the British Museum. In 1954, Japanese cetologist Munesato Yamada published accounts of a "rare porpoise" discovered in 1952 by whale hunters working from Honshū. He wrote that the individuals he examined had skulls matching those in the museum and that the body had features similar to the killer whale, and proposed the common name lesser (or pygmy) killer whale. Despite its name and features, the pygmy killer whale is not closely related to the killer whale.
The scientific species descriptor attenuata is Latin for 'tapering' and refers to the gradual narrowing from the head to the tail fin.
Read more about Pygmy Killer Whale: Description, Population and Distribution, Conservation
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