Scientists are still determining which of the mammals in this picture is more fuzzy. Either way, you win: it's a picture of a bearded Matt Ravosa with a llama.
If you’re looking for information on the evolution and function of jaws, University of Notre Dame researcher Matt Ravosa is your man.
Not Jaws the shark, mind you - jawbones. Specifically the jawbones of mammals, like, say, humans. Or llamas.