Learn more about these big-nosed monkeys. Find out why scientists think these primates have such outsized organs.

The implications are severe for both predators and prey – monkeys aren’t nutritionally optimal for big cats, while increased predation pressure threatens already vulnerable primate populations.

Anti-predator strategies of non-nocturnal primates -- Anti-predator strategies in a diurnal prosimian, the ring-tailed lemur (Lemur catta), at the Beza Mahafaly Special Reserve, Madagascar / Lisa ...

Monkeys are easily some of the most common animals in the Amazon, with nine different species living there. However, one that you are most likely to encounter is the squirrel monkey.