American scientists have confirmed the discovery of a two-headed bull shark foetus - believed to be the world's first ever.
The single shark - with two heads - was found in the Gulf of Mexico, according to a study by Michigan State University and reported in the Journal of Fish Biology.
It was discovered by a fisherman when he opened the uterus of an adult shark in 2011, around a year after the Deepwater horizon oil spill, in the Gulf of Mexico.
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