Two-headed sharks sound like a monster ripped straight out of a B-list horror movie, but scientists are increasingly finding more of them worldwide. Some have suggested that the surge in mutants is due to genetic abnormalities triggered by over-fishing. The puzzling trend started in 2008, when fisherman Christian Johnson caught a two-headed blue shark

embryo off the coast of Australia. In 2013, a group of Floridian fishermen strained to haul in a large Bull shark, but upon gutting it found that its uterus housed a two-headed fetus. Blue sharks have so far produced the most two-headed offspring, because they carry large litters of up to 50 babies at a time in the womb. READ MORE