Why shark embryos gobble each other up in utero
By Tia Ghose, LiveScienceShark embryos cannibalize their littermates in the womb, with the largest embryo eating all but one of its siblings.Now, researchers know why: It's part of a struggle for paternity in utero, where babies of different fathers compete to be born.The researchers, who detailed their findings Tuesday in the journal Biology Letters, analyzed shark embryos found in sand ...
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