Gibbon arms are extremely long compared to their body size—often longer than their legs. This is index ideal for brachiation. Brachiation is the primary mode of locomotion for gibbons—swinging from branch to branch using their arms. Long arms allows them to reach distant branches, reducing the energy required to move through the forest canopy. Shoulder joints are highly mobile, allowing a full range of rotation for swinging. The IUCN Red List status for White-handed gibbons is Endangered, indica