Optimal Foraging Theory

Optimal foraging theory is a model in behavioral ecology proposing that natural selection favors foraging strategies that maximize an animal's net rate of energy intake, balancing the energetic costs of searching for and handling food against the energetic benefits it provides. Foundational versions of the theory were developed in the 1960s, including work by Robert MacArthur and Eric Pianka in 1966 on which food types a forager should include in its diet, and extended by Eric Charnov's 1976 marginal value theorem, which predicts the point at which a forager should abandon a depleting food patch in favor of searching elsewhere. The theory has been tested across a wide range of species, from birds to insects to large mammals, and while it broadly predicts real foraging behavior, actual animals often deviate from its strict optimality predictions due to complicating factors such as predation risk, incomplete information about food availability, and the needs of dependent offspring. Optimal foraging theory remains a central quantitative framework within behavioral ecology for generating testable predictions about animal feeding behavior.