Beast Quest: Claw the Giant Monkey by Adam Blade

Claw was an enormous monkey. His chest was as wide as Storm was long, and his limbs were thicker some of the tree trunks around them. He sat hunched among the branches, a hideous creature with a lethal-looking claw at the tip of his long, snake-like tail. Huge, hairy black arms, legs and feet ended in vicious, curved. His face was covered in matted black hair, but his squashed snout was hairless. Drool hung in ropes from his long teeth. And his fierce yellow eyes were trained directly on Tom.