A male gorilla that helps protect his offspring from an attack by a tiger is evidence that the evolution of altruistic behavior is driven by kin selection.
The expression kin selection makes reference to a behavior where self-sacrifice enhances the fitness of individuals of the same species.
This behavior (kin selection) has been selected to increase the fitness of the species and populations.
In conclusion, a male gorilla that helps protect his offspring from an attack by a tiger is evidence that the evolution of altruistic behavior is driven by kin selection.
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