Knowra Brachiation Brachiation Brachiation is locomotion by swinging from one overhead handhold to another, using the arms to support and propel the body. It is characteristic of gibbons and other specialized climbers.
Pendulum : A body suspended from a pivot that swings under gravity along an arc. A brachiator’s body swings beneath each handhold, though active limb motion modifies a simple pendulum’s path.
Gibbon : A small, tailless ape native to the forests of South and Southeast Asia. Gibbons are the clearest living specialists in rapid, arm-swinging brachiation.
Siamang : A large, black-furred gibbon native to the forests of Sumatra and the Malay Peninsula. Its long arms and canopy travel make it a prominent living example of brachiation.
Gibbon locomotion : The movement patterns gibbons use to travel, forage, and avoid obstacles in forest canopies. Brachiation is central to gibbon travel, but gibbons also climb and leap.
Shoulder joint : A ball-and-socket joint connecting the upper arm to the shoulder girdle. Its mobility lets brachiators reach, rotate, and absorb forces at successive handholds.
Hylobatidae : The family of small apes comprising gibbons and siamangs. Its members show the anatomical specializations most closely associated with brachiation.
Lar gibbon : A gibbon species native to forests of mainland Southeast Asia and Sumatra. Its movement illustrates how brachiation operates in a widespread, well-studied gibbon.
Canopy : The upper layer of a forest formed by the crowns and branches of trees. Overhead branches create the connected supports brachiators use to cross forests.
Arboreal locomotion : Movement through trees by animals that climb, leap, walk, or swing among branches. Brachiation is a specialized form of movement through trees.
Hominoidea : The primate superfamily that includes apes and humans. Gibbons belong to this broader group, whose members lack external tails.
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