What feature is associated with arboreal quadrupeds?

Arboreal quadrupeds, which are animals that primarily live in the trees and move around on all fours, are characterized by specific physical adaptations that facilitate their lifestyle. The correct answer emphasizes that these animals typically possess long limbs. Long limbs are advantageous for moving through trees as they allow for greater reach and the ability to navigate gaps between branches effectively. This adaptation aids in both climbing and leaping, which are essential for foraging, escaping predators, and moving within a complex three-dimensional environment.

In contrast, the other options do not align with the functional attributes required for an arboreal lifestyle. Short digits would limit grip and climbing ability, a narrow skeleton may not provide the necessary strength and stability for moving through trees, and short tails typically do not offer the balance that is vital for navigating tree branches. Therefore, the adaptation of long limbs is crucial for the survival and mobility of arboreal quadrupeds in their natural habitats.