The Upright Ape: Hominiform Progression - 2

[theuprightape]

This is how they move naturally in the wild. This has been documented for many years. In this case, they are raised in the same enclosure with Orangutans who do fist walk (similar to knuckle walking which is done by chimpanzees and gorillas), but the Siamangs still use their natural method which is upright bipedal walking.

[moukidelmar]

These gibbons are at a zoo. Do you think they are just copying the people they are seeing?

[jvsears]

Very interesting!