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

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Primates have larger brains ...

Some monkey species have unique mating habits that make it difficult to know which monkey fathered a specific infant. However, studies have shown that even if a young monkey doesn’t know who its ...