Evidence that humans and nonhuman animals have a highly developed capacity to recognize their relatives supports the idea of

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The highly developed capacity to recognize relatives is a key factor in kin selection, which states that animals will often act in ways that benefit their relatives (who share a portion of their own genes) to increase the survival and reproductive success of their genetic line. This can include behaviors like parental investment, mate preferences, and other actions that help relatives succeed. Exclusive fitness, on the other hand, is the idea that an individual's own reproductive success is the most important factor, regardless of relatedness to others.

Evidence That Humans and Nonhuman Animals Have a Highly Developed