Predators prefer prey with:
Energy gained per handling time, E/h, is the standard measure of prey profitability after encounter. A high value means the predator obtains a large energetic return while spending relatively little time pursuing, subduing, or processing the item. Optimal diet theory ranks such prey above items with low E/h and predicts their acceptance whenever encountered, assuming capture risk and nutritional constraints are comparable. High search time concerns how frequently prey are found rather than their handling profitability. Equal profitability provides no preference without other differences. Selec
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 10