This sea slug cut off its own head—and lived to tell the tale

It was “like a horror movie.” That’s how ecologist Sayaka Mitoh describes the scene at her lab at Nara Women’s University in Japan one day when she was studying sea slugs. One of the slimy aquatic critters had lost its body, and its head was crawling around the bottom of a tank. “We thought that it would die soon without a heart and other important organs,” she says.

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