Most monkeys are omnivores; they eat plant-based foods, such as fruits and nuts, as well as some meat, such as lizards and bird eggs. Monkey diets can shift with changing seasons. Northern Muriqui Monkeys are the most peaceful primates in the world, living in uniquely egalitarian societies where relationships between males and females are free of conflict, and instead full of hugs. Overall, monkeys are not good pets. Yes, some can be quite sweet for a time. But the reality is monkeys are capable of causing too much harm and need too much care and attention to thrive in a human household. These issues are equally as important when it comes to apes like chimpanzees, orangutans, and gibbons. Some monkeys live on the ground, while others live in trees. Different monkey species eat a variety of foods, such as fruit, insects, flowers, leaves and reptiles. Most monkeys have tails. Groups of monkeys are known as a tribe, troop or mission. Monkeys sleep while sitting in trees! Did you know that the Pygmy Marmoset monkey is the smallest monkey.