| altruistic | Benefiting others without regard for one's own needs or safety.
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| analogies | traits shared by two or more species that are similar in function but unrelated evolutionarily.
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| ethology | The study of the natural behavior of animals under natural conditions.
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| homologies | Traits shared by two or more species through inheritance from a common ancestor.
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| inclusive fitness | The idea that fitness is measured by the success of one's genes, whether possessed by the individual or by that individual's relatives.
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| reproductive strategies | Behaviors that evolve to maximize an individual's reproductive success.
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| savanna | The open grasslands of the tropics.
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| sociobiology | The scientific study that examines evolutionary explanations for social behaviors within species.
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2002 McGraw-Hill Higher Education