Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A worldwide community photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

Mantled Howler Monkey

Alouatta palliata


This particular monkey is an adolescent. It is probably about 15 - 18 months old. It weigh approximately four kilos and is about two feet long without it's tail. Howler Monkey's are herbivores and spend their days and nights in the trees. Only when they have no way to get from one tree to the next (primarily due to deforestation) they go to the ground and move quickly to get to the next tree. In this case, they were using an overhead electrical wire to go from a mango tree to some secondary forest sized trees where they continued to feed. They must move from tree to tree in order to insure they don't become poisoned by eating too much of any one leaf specie. they live in Family groups whereby there is an alfa male that has mating, roosting, and eating rights over all others. Alpha males are in charge of taking the families (averaging 15 in size) through their feeding grounds which are typically one square kilometer/group. Howler Monkey's can live up to 25 years.


Tropical dry forest in NW Guanacaste, Costa Rica. This is four months into the seven month rainy season.

Species ID Suggestions

Sign in to suggest organism ID


LarryGraziano 6 years ago

Thank you Christine!

Christine Y.
Christine Y. 6 years ago

Congratulations Larry, Great spotting and information.

LarryGraziano 6 years ago

Thank you so much to all of you!

triggsturner 6 years ago

Congrats Larry on your SOTD.

remkinloch 6 years ago

Congratulations on SOTD. Always interesting to see first hand how wild animals adapt to the humanised environment.

DanielePralong 6 years ago

Congratulations Larry, your juvenile Mantled Howler is our Spotting of the Day!

"This juvenile Mantled Howler (Alouatta palliata) is our Spotting of the Day! This spotting from our ranger Larry Graziano highlights work towards protecting mantled howlers from consequences of deforestation. Howler monkeys need to move from tree to tree to feed and sometimes use electrical cables to do do. In the spot where this photo was taken (NW Guanacaste, Costa Rica) 1400m of new poles and insulated cables were installed to prevent the monkeys from getting electrocuted while moving from forest patch to forest patch.
Find out about SalveMonos, a local non-profit organization dedicated to the protection and rescue of monkeys that Larry is part of: "



Spotted by

Tamarindo, Provincia Guanacaste, Costa Rica

Spotted on Aug 18, 2017
Submitted on Sep 10, 2017

Spotted for Mission

Related Spottings

Mono aullador rojo mono aullador Mantled Howler Monkey Mono aullador

Nearby Spottings

Chrysalis Elf Butterfly Reddish Egret (white morph) Silver Argiope
Noah Guardians
Noah Sponsors
join Project Noah Team

Join the Project Noah Team