Recently the focus of research in behavioral ecology has been on the contribution by behavior to an animal's reproductive success.What is this called?

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The term used to describe the contribution of an animal's behavior to its reproductive success is "fitness." Fitness is a measure of an individual's ability to survive and reproduce in its environment, and it is influenced by a variety of factors, including behavior. Researchers in behavioral ecology study the ways in which specific behaviors, such as mate selection, territorial defense, and parental care, can affect an animal's fitness.

Recently the Focus of Research in Behavioral Ecology Has Been