Have you watched the movie Mutant Ninja Turtles? The mutations makes them what they are known for, abnormal,enlarged and different from their race. The pictures in this post have been of living mutant cratures that are mostly two headed. Some are for various reasons others are natural but it is evident from the following pictures that they exist in the world today:
[youtube https://www.youtube.com/watch?v=dv486goSIzk&w=560&h=315]