A Vervet monkey takes a nap until a bell goes off and wakes him up. Vervet monkeys are Old World monkeys, which means they are closely related to apes, more so than the New World monkeys. Like other Old World monkeys and some chimpanzees, they have sitting pads on their posterior, allowing them to sit and sleep upright. They can nap during the afternoon anywhere from 5 to 30 minutes, depending on the bustle. They are genetically wired to be aware of their environment at all times, so if they hear something, they are most likely woken up and attentive to find out what it is.

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