Biologists were sorting through hundreds of Atlantic sawtail catshark embryos for a study on how the sharks’ cardiovascular system develops, when they spotted an embryo with two heads. This is the first time a two-headed conjoined twin has ever been recorded in an egg-laying shark.

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Biologists were sorting through hundreds of Atlantic sawtail catshark embryos for a study on how the sharks’ cardiovascular system develops, when they spotted an embryo with two heads. This is the first time a two-headed conjoined twin has ever been recorded in an egg-laying shark.