Endangered animals By Nick A. Romero, Biologist and environmental educator. March 31, 2022 In terms of taxonomy, it can be a little difficult to understand what constitutes a monkey. While many people will differentiate them from apes, both are part of the infraorder Simiiformes. Monkeys are also broken down into two large families known as New World monkeys (Platyrrhini) and Old World monkeys (Catarrhini). This classification is according to their origin. These primates have a fundamental role in ecosystems, even using their feces to pollinate. This is why the increasing amount of monkey species under threat is both so alarming and critical.At AnimalWised you can learn more about this existential threat to our planet's biodiversity with our list of the 20 most critically endangered monkey species. We provide information on why they are under threat, as well as photos so you can see what they look like.You may also be interested in: Are Spider Monkeys Endangered?ContentsGreater bamboo...