• Howler monkeys are considered the loudest land animal.
• According to Guinness Book of World Records, it can be heard clearly for 3 miles (5 km).
• Howler monkeys are the only folivores of the New World monkeys. Howlers eat mainly top canopy leaves, together with fruit, buds, flowers, and nuts.
• As their name suggests, vocal communication forms an important part of their social behavior. They have an enlarged basihyal or hyoid bone which helps them make their loud sound.
• These monkeys are native to South and Central American forests.
• They rest about 80 percent of the time and are considered the least active of all monkeys.
• They live in groups of usually about 18 individuals.
• Howlers are called “congos” in Nicaragua and Costa Rica.
• In Belize they are called “baboons”, although they are not closely related to the genus Papio, which usually carries that name.
• Howler monkeys have a short snout, and wide-set, round nostrils.
• They range in size from 56 to 92 cm, excluding their tail which can be equally as long.
• These monkeys weigh 15 to 22 lbs (7 to 10 kg).
• Howler monkeys have beards and long, thick hair which may be black, brown, or red.
• Unlike other New World monkeys, both male and female howler monkeys have trichromatic colour vision. This has evolved independently from other New World monkeys due to gene duplication.
• They have an average lifespan of 15 to 20 years in the wild.
• Howler monkeys live in groups where the number of females is greater than the number of males. Groups may have only one male or several males.

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