http://news.ninemsn.com.au/world/2013/03/27/05/40/scientists-confirm-two-headed-bull-shark
Scientists have confirmed the discovery of the first ever two-headed bull shark. The specimen was found by a fisherman inside the uterus of an adult shark captured in the Gulf of Mexico, off the US southeast coast, in April 2011.
It died shortly after being discovered — and experts say it is unlikely to have survived in the wild had it been born.
This is the first record of "dicephalia" in a bull shark, said Michael Wagner from Michigan State University , who confirmed the discovery with colleagues at the Florida Keys Community College.
The findings of their research have been published in the Journal of Fish Biology.
They say MRI scans revealed two distinct heads, hearts and stomachs with the remainder of the body joining together in the back half of the shark to form a single tail.
The cause of the dicephalia is not known and there is still no evidence to link the mutation with the disastrous oil spill in the gulf in 2010, the scientists said.
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