Monkey is a versatile animal that thrive in all kind of environment. But, in small island, towns their numbers are declining. They are great climbers, and pollinators in large forest of Africa, Asia, South America, and tropical islands. Deforestation in the savanna has caused habitat loss, and degradation of land.
Mountain and tropical forests are losing biodiversity because monkeys help disperse seeds and fruit from tallest trees around the mountain. Monkeys are not farmers, but the distance they can jump from tree to tree helps seeds get to fertile soil. A rich forest has many monkeys, and lot of fruits.

https://youtu.be/ODyB9i6bGwQ?si=42jC6dyWbV4jt9Op