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Joel Brown and colleagues showed that high moonlight intensity inhibits the activity of the Arizona pocket mouse (Perognathus amplus), a result explicable in terms of benefits and costs: greater lunar intensity may not enable the mice to increase foraging success enough to offset the higher chance of detection by predatory owls or hawks. Most other nocturnal mammals respond to lunar intensity variations similarly to Arizona pocket mice, but Azara's night monkeys (Aotus azarae) display the opposite pattern, as their heavy reliance on visual foraging results in a different balance of reward and risk.