Fig. 1: Simple heuristics to time patch-leaving decisions.
From: Differential patch-leaving behavior during probabilistic foraging in humans and gerbils

Using a fixed-time rule (a), the patch is left independent of the number of prey encounters (green stars), whereas a patch is left after a fixed number of prey encounters have been found if a fixed-number rule is used (b). According to incremental rule (c), each prey capture increases the probability of staying in a patch, postponing the patch-leaving. Using the giving-up-time rule (d), the tendency to stay in the patch declines as a function of an unsuccessful search and each prey capture resets this tendency to a maximum.