Published on January 28, 2017
A slew of rare two-headed sharks have been found from California to the Caribbean and from Mexico to the Mediterranean, leading scientists to ponder why.
A two-headed embryo of an Atlantic sawtail cat shark was found recently in the Mediterranean Sea. It was the first oviparous, or egg-laying, shark ever documented with two heads. Each head contained a mouth, two eyes and a brain, and were joined behind the gills, according to a paper published Oct. 9 in the Journal of Fish Biology. The species is considered near threatened.
