The physical adaptations include their eyes, ears, length of arms and legs and tails.
The monkey uses eyes to locate food. Their ears are used to hear danger from predators. They length of arm and legs are important so they can swing easily and keep away from predators. They have tails to wrap around branches. They also use tails for balance and brakes. The tail can make up for their thumbs, since they don't have thumbs. They use their tails to carry objects. Under their tails they have a fleshy pad which helps to hang firmly. The tails is strong enough to hold their entire body so they can swing from tree to tree.