Which hypothesis suggests that modern primates engaged in leaping rather than slow locomotion?

The Grasping-Leaping Hypothesis posits that the evolutionary adaptations seen in modern primates are reflective of their behaviors, particularly in their movement patterns. This hypothesis suggests that early primates adapted to an arboreal environment, where leaping from branch to branch was more beneficial than slow locomotion.

Under the pressures of foraging for food or escaping predators in a three-dimensional arboreal habitat, those primates that developed the ability to leap effectively would have had an advantage. This leaping ability allowed them to exploit different layers of the forest canopy, access food resources more efficiently, and evade threats. Thus, the adaptations related to grasping and leaping are seen as key factors in the evolutionary success of modern primates.

In contrast, the other hypotheses listed—such as the Visual Predation Hypothesis, which focuses on the visual capabilities of primates for hunting insects, or the Angiosperm Co-evolution Hypothesis, which relates to the relationship between flowering plants and the evolution of fruit-eating primates—do not specifically address leaping as the primary locomotion strategy in the same way as the Grasping-Leaping Hypothesis does.