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Optimal foraging theory (OFT) holds that animals' foraging behaviors reflect cost-benefit trade-offs that vary by species and with dynamic ecological circumstances. One circumstance is lunar intensity, which W.J. Cresswell and Stephen Harris found to be negatively associated with foraging by European badgers but Eduardo Fernández-Duque and colleagues found to be positively associated with foraging by Azara's night monkeys. This discrepancy is explicable in terms of OFT: the monkeys' greater reliance on vision means that higher lunar intensity benefits them more than it benefits the badgers.