White-handed Gibbon Monkey found in Schonbrunn Zoo. Lar gibbons are one of the pickiest eaters in the primate world. They are mainly frugivores, but they will also eat other plant matter. They consume ripe fruit only, and only new leaves and buds. They have several adaptations for feeding. One of them is brachiating locomotion, which involves swinging from branch to branch by their arms. This style of motion allows them to reach the periphery of the tree canopy, where most of their food is found.