Final answer:
The statement that Colobine monkeys are specialized leaf-eaters referred to as 'leaf-eating monkeys' is true; they have evolved adaptations allowing them to effectively digest mature leaves.
Step-by-step explanation:
The statement that Colobine monkeys specialize in eating mature leaves, and are referred to as "leaf-eating monkeys" is true. Colobine monkeys are indeed adapted to a leaf-eating diet, with complex stomachs that ferment fibrous plant materials, allowing them to extract nutrients effectively from leaves. The term "leaf-eating monkeys" is an informal way to describe this primate group that focuses on a folivorous diet. Other primates, such as spider monkeys, may have a more varied diet and are known for being arboreal mammals that possess prehensile tails used for grasping branches, unlike the colobines which are more specialized.