In all, there are nine species of gibbons, and all of them are native to Southeast Asia.
Gibbons are extremely arboreal in nature and almost never come down to the ground.
They often do this at very high speeds an d they routinely fling themselves across 30 foot gaps between branches. They then grasp the next branch with one hand and swing themselves further along. Most people who watch gibbons come to the conclusion that they are the world's greatest acrobats. Given the high speed and accuracy with which they move through the treetops, it is suspected that gibbons must memorize the location of most of the branches in their territory. This way, when they come around a corner, they can fling themselves off in to space already knowing the direction of the next hand hold.