Two Heads Are Better Than One

             

                               Out of several turtles being hatched in the San Antonio Zoo, employees are finding it hard to maintain a head count. A female cooter turtle was born with not one head, but two heads; named Thelma and Louise. Fortunately, the two-headed turtle appears healthy and is able to function properly, being able to  swim and walk. Most born like this don't survive long in the wild, but experts claim that she will be able to live healthily.

This birth deformity is called Polycephaly, found in many occurrences. Although not common, this is not a rare abnormality and has been documented many times before. Polycephaly is an extreme case of conjoined twins. How this happens is, depending on when the split happens between the embryos, twins can either grow in their own sac with their own placenta or they can share a sac and placenta which allows them to share a body.



http://www.huffingtonpost.com/2013/06/26/two-headed-turtle_n_3504540.html