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MYSTERY: Two-Headed Sharks Becoming More Common

LNM Radio Network

LNM Radio Network

MYSTERY: Two-Headed Sharks Becoming More Common
Two-headed sharks may sound like a figment of the big screen, but they exist—and more are turning up worldwide, scientists say.

A few years ago off Florida, fishermen hauled in a bull shark whose uterus contained a two-headed fetus. In 2008, another fisherman discovered a two-headed blue shark embryo in the Indian Ocean.

And a 2011 study described conjoined twins discovered in blue sharks caught in the Gulf of California and northwestern Mexico. Blue sharks have produced the most recorded two-headed embryos because they carry so many babies—up to 50 at at time, says study leader Felipe Galván-Magaña, of the National Polytechnic Institute in Mexico.
http://news.nationalgeographic.com/2016/11/sharks-two-headed-oceans-mutations/