Humans are indeed the only animals with true chins, defined as a specific bony protrusion that juts out from the lower jaw. Other animals, including our closest relatives like chimpanzees and gorillas, lack this feature; their lower jaws slope backward without forming a chin. Even extinct relatives such as Homo erectus and Neanderthals did not have chins. While some animals like elephants and manatees have chin-like structures, these do not qualify as true chins. The exact reason humans have chins remains a mystery, with theories suggesting it might be an evolutionary byproduct rather than serving a specific purpose such as aiding speech or chewing.
