James Pampush is an associate professor at High Point University who has studied and written about the evolution of human and primate faces. He wrote a fascinating piece a few years back (that I just learned about) regarding the burning question, "why are humans the only animals with chins?"
James Pampush, PhD | High Point University
The enduring puzzle of the human chin - PubMed
A Chin-Stroking Mystery: Why Are Humans the Only Animals With Chins? | Smithsonian
Why Do Humans Have Chins? A Scientist Explains The 'Enduring Puzzle' : NPR