Brachiation

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File:Brachiate.jpg

Brachiating siamang at the Cincinnati Zoo

Brachiation (from "brachium", Latin for "arm") is a form of arboreal locomotion in which primates swing from tree limb to tree limb using only their arms.

Brachiators

The only true brachiators are the lesser apes (gibbons and siamangs).^{[citation needed]} A gibbon can brachiate at speeds as high as 35 mph (55 km/h) and can travel as far as 20 feet (6 m) with each swing.^{[citation needed]} Spider monkeys and orangutans are considered semibrachiators.

Traits that aid brachiation

Some traits that allow primates to brachiate include short fingernails (instead of claws), inward-closing hook-like fingers, opposable thumbs, long forelimbs, and freely rotating wrists.

Brachiation and great apes

Modern humans retain many physical characteristics that suggest a brachiator ancestor, including flexible shoulder joints and fingers well-suited for grasping. In lesser apes, these characteristics were adaptations for brachiation. Although great apes do not normally brachiate (with the exception of orangutans), our human anatomy suggests that brachiation may be a preadaptation to bipedalism, and healthy modern humans are still capable of brachiating. Some children's parks include monkey bars which children play on by brachiating.

See also

• Hand-eye coordination
• Suspensory behavior

References

1. Rice, Patricia C.; Norah Moloney (2005). Biological Anthropology and Prehistory: Exploring our Human Ancestry. Pearson Education, Inc., pp. 178–179, 192. ISBN 0-205-38196-0
2. Britannica.com
3. Dictionary.com
4. MSN Encarta (Archived 2009-10-31)