We recently covered a two-headed bull shark fetus that was found by a fisherman and described by scientists in a journal. That story got more than ninety comments and more than four thousand Facebook likes, and it got us thinking about what other two-headed creatures might have been found.

So in lieu of this week’s Freshwater Species of the Week, we did some research and put together this short list of some of the more interesting two-headed animals.

As we recently reported, the two heads typically arise through a process called “axial bifurcation,” in which the embryo doesn’t finish splitting into twins. This condition has been seen in a number of animals, including human beings.

In addition to gawking