Why do we have chins? Researchers may finally know

image via New Scientist

April 1, 2026, 10:00 AM

• •The human chin is unique among primates.
• •Research suggests the chin is a byproduct of evolution, not direct selection.
• •Changes in teeth and jaw size influenced chin development.
• •The concept of 'spandrels' explains traits arising from other evolutionary forces.

Humans are unique in possessing chins, a trait that has long puzzled scientists. A recent study suggests that the human chin is not a product of direct natural selection, but rather a byproduct of changes in jaw and skull structures. The research indicates that the chin's evolution is linked to the reduction in tooth and jaw size. This study offers a more nuanced understanding of human evolution, moving beyond the idea of every trait having a specific function.

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