Humans are the only animals with chins.

Try to picture another animal besides a human with a chin. You're probably not able to, right? Well, that's because humans are the only animals with chins. Of course, other animals have jaws, but as anthropologist James Pampush told The Atlantic, "only humans have chins." Though scientists aren't entirely sure why we have this feature, one theory is that our chins make it easier for us to chew. Who knew?