Howler monkeys live up to their moniker by being noisy – so noisy, in fact, that their calls can be heard up to three miles (5km) away and reach 140 decibels, according to one estimate. By comparison, a jet engine at takeoff reaches about 150 decibels – enough to damage an eardrum. Howler monkeys make a loud whooping noise or roar to establish their territories, with neighbouring troops howling back and forth to let others know their locations.

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