https://kids.nationalgeographic.com/animals/howler-monkey/

Howler monkeys are the loudest of all monkeys. They call to let others know where their territory is, alerting them to stay away. The calls sound like a loud ...

https://www.nationalgeographic.com/animals/mammals/group/howler-monkeys/

Hear the booming cries that gave the howler its name. Learn just what these vocal monkeys may be trying to say.

https://www.monkeyworlds.com/howler-monkey/

The Howler Monkey is a large type of New World Monkey. There name comes from the fact that they are louder than any other types of Monkeys.

https://nationalzoo.si.edu/animals/black-howler-monkey

Black howler monkeys are the loudest terrestrial animals in the Western Hemisphere! Found in South America, they are usually the largest, most abundant ...

https://en.wikipedia.org/wiki/Howler_monkey

Howler monkeys are among the largest of the New World monkeys. They are famous for their loud howls, which can travel three miles through dense rainforest .

http://www.wildernessclassroom.com/wilderness-library/howler-monkey/

Nov 29, 2008 ... Howler Monkeys are some of Costa Rica's loudest inhabitants. It is said that the call of a howler monkey can be heard for 3-4 miles even ...

https://www.youtube.com/watch?v=REPoVfN-Ij4

Aug 18, 2008 ... Don't tell these howler monkeys to pipe down. They won't unless there sleeping, which is about 15 hours a day. ➡ Subscribe: ...

https://www.anamayaresort.com/howler-monkeys/

Oct 7, 2013 ... Biology. One of Nicoya Peninsula's (and Costa Rica's) most commonly spotted mammals; the Mantled Howler Monkeys are recognized for their ...

https://www.bioexpedition.com/howler-monkey/

May 16, 2013 ... Facts and Information about Howler Monkeys. Howler Monkey Description, Behavior, Feeding, Reproduction. Howler Monkey threats and ...

https://www.ncbi.nlm.nih.gov/pubmed/24865565

May 27, 2014 ... The function of loud calls in black howler monkeys (Alouatta pigra): food, mate, or infant defense? Van Belle S(1), Estrada A, Garber PA.