The chin is the forward pointed part of the anterior mandible (mental region) below the lower lip. A fully developed human skull has a chin of between 0.7 cm and 1.1 cm. What is a cleft chin?

Understanding the Context

A cleft chin is a noticeable indentation in the center of the chin. Rather than a smooth “U” shape, a cleft chin (or “butt chin”) has a “W” like shape caused by a dimple or indentation that runs from the bottom of the jaw up toward the mouth. What Is a Cleft Chin? Plus, Causes & How to Get Rid of It So why are we the only species with a chin?

Key Insights

This question is hard to answer because experts haven't agreed on a single definition of a chin. Why are humans the only species with a chin? - Live Science 'My chin was still leaking': California cop slams Black teen on the ... Why do humans have chins and orangutans do not? Humans are the only animals with a chin.

Final Thoughts

This trait is entirely absent in other primates, animals, and even our extinct relatives, such as Neanderthals. Chins have been a long-standing mystery of human evolution. But a new research paper may have discovered the answer. Humans are the only animals with a chin – and now we know why