Heikegani (平家蟹, ヘイケガニ, Heikeopsis japonica) is a species of crab native to Japan, with a shell that bears a pattern resembling a human face which is interpreted to be the face of an angry samurai hence the nickname samurai crab. It is locally believed that these crabs are reincarnations of the Heike warriors defeated at the Battle of Dan-no-ura as told in The Tale of the Heike. While the crabs are edible, they are not eaten by Japanese.
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Thanks. I had no idea that human beings might have given natural selection a push.