Howler monkey roars exaggerate body size but are truthful to other howlers

Howler monkeys are relatively small primates known for their incredibly loud, low-frequency roars that sound as if they come from a much larger creature. This is useful in the animal kingdom because ...
Mongabay

Brazil takes pioneering action — and a vaccine — to rewild howler monkeys

Brown howler monkeys (Alouatta guariba), endemic to the Atlantic Forest in Brazil and Argentina, became one of the 25 most threatened primate species following a yellow fever outbreak in late 2016. In ...
The Tico Times

Costa Rica Wildlife: Meet the Mantled Howler Monkey

Alejandro Zúñiga / The Tico Times. To many first-time visitors to Costa Rica’s varied forests, mantled howler monkeys are the first indication that they are somewhere wild. Often heard before they’re ...