Mikkel Høegh Post, M. Skovrind, et al., Scientific Reports 9, 7729 (2019)

What happens if you cross a narwhal with a beluga? You get a narluga

In 1990, researchers found a bizarre whale skull, unlike that of any known species, displayed on the roof of a hunter’s house in western Greenland. Thirty years later, they’ve finally figured out what it is: a cross between a narwhal and beluga, The New York Times reports. The narluga, as they’ve called it, is the offspring of a female narwhal and a male beluga—two species that have never been known to mate before, the researchers write in Scientific Reports. DNA analysis revealed the parentage, and carbon isotopes in the skull revealed the narluga had considerably different feeding behaviors from either of its parents—until it wound up on a human hunter’s plate.

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