Hatena::Groupastrobot

Brachiation

Brachiation

http://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Brachiate.jpg/220px-Brachiate.jpg

(サルが枝にぶらさがり木を移動する行動)腕渡り

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.

The only true brachiators are the lesser apes (gibbons and siamangs). 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.