Brown howler monkeys spend more time resting during hot weather and leaf-rich diets; study finds

Life in the Atlantic Forest is rarely static. Even animals that spend much of their time high in the canopy must constantly ...
Phys.org

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 ...