Amazon River Basin. Jaguar and large reptiles and birds of prey. There are two species of Woolly monkeys. They are the largest monkey in South America. For example, a Humbolt's Woolly monkey female is around 50 cm in length, has about a 65 cm tail, and weighs around 5.5 kg.
Males generally weigh more.
Sit on their tails to hold them up. They have prehensile tails which act like a 5th limb. Their tails can support their full weight. They usually travel in groups of 15-25. The Woolly monkey rarely comes down to the ground and sleeps about 150 feet above the ground.