William D. Hamilton (biologist)

William D. Hamilton was a renowned British biologist best known for his work on evolutionary biology and social behavior. He developed the concept of "kin selection," which explains how animals can increase their chances of passing on their genes by helping relatives survive and reproduce. This idea helps explain altruistic behaviors—actions that benefit others at a cost to oneself—in the animal kingdom. Hamilton's research significantly advanced our understanding of cooperation, altruism, and the evolution of social behaviors in both animals and humans. His work remains foundational in evolutionary biology and behavioral science.