Final answer:
A prehensile tail is an adaptation found in arboreal New World monkeys like the spider monkey, acting as an additional limb for grasping branches and aiding in feeding.
Step-by-step explanation:
The tail that acts as a kind of hand for support in trees and can suspend the body from a branch, allowing the hands and feet to be used for feeding, is known as a prehensile tail. This adaptation is common among New World monkeys, such as spider monkeys, which are arboreal mammals. These primates can grasp and hold onto branches with their prehensile tails, which function much like an additional limb. Additionally, adaptations such as very long arms, which are used for brachiation, and stick pads on their fingers, contribute to their remarkable climbing abilities. Other primates have different adaptations that enable them to live in various environments, such as webbed fingers in some species for swimming, enlarged brains opposable thumbs for tool use, and increased manual dexterity.