What characteristic of *Lagothrix* locomotion contrasts with the more agile spider monkey (*Ateles*)?

Woolly monkeys exhibit a more robust build relying on powerful grasping and suspension.

While both woolly monkeys and spider monkeys are specialized for arboreal life within the Atelidae family, their locomotor strategies show distinct optimization. Spider monkeys, *Ateles*, are noted for their extreme agility, leaning towards brachiation, and often possess a slenderer build and longer tail. In contrast, the woolly monkeys (*Lagothrix*) are described as more deliberate and robust. Their morphology favors powerful grasping and suspension techniques, allowing them to exploit structural elements, like tougher branches or heavier fruit clusters, that might not suit the lighter, faster movements of their relatives. This divergence illustrates niche partitioning within the same family structure.