Why do gibbons switch to two legs?

A team of scientists from the University of Illinois at Urbana - Cahmpaign (USA), led by Dr. Bryan Richmond, conducted comparisons of pelvic bone and shin bones of five gibbon species found in other areas. each other in Africa with pelvis of homo sapiens.

As a result, gibbon species live in caves and grasslands with pelvic bones and long lower leg bones like homo sapiens.

According to Dr. Bryan Richmond, people only really learn to walk on two feet when environmental conditions force them to do so. He said: 'We do not object to the hypothesis that walking on two feet helps people release their hands to use tools to work or collect fruits above.

However, these are not the most important reasons people think. See that many species of gibbons are still standing on their legs to pick fruit if they need to, but usually they prefer to climb on four feet.

It is possible that the process of forest reforestation did not happen abruptly (such as forest fires) as has happened for a long time.

As a result, our ancestors had time to understand that the long front legs were of no use, as well as the disadvantage of crawling on all fires. And it was this situation that forced ape of humans to tend to walk on two legs'.

NGUYEN SINH