Spider monkeys are New World monkeys in the genus Ateles, well-adapted for life in trees. They have a prehensile tail acting as an extra limb to aid in climbing and swinging through the trees. They primarily inhabit tropical rainforests from Mexico to Bolivia, and also reside in semi-deciduous forests and mangroves. Adaptations include opposable thumbs, prehensile tails, and living in large, social groups. Climate change could create a very dry climate, causing trees to dry out. Surprisingly, in the Amazon, dry spells spur plant growth because deep tree roots access water even during dry periods. Disturbed areas, like logged regions, cannot reach deep water and thus go dormant or die in dry seasons. In the future, spider monkeys might have shorter tails, longer legs, stronger hands, and adaptive traits like the ability to climb cactuses, eat them, and conserve water in their stomachs.