Going with two legs starting with pear action?

Somewhere in the dark past, about 4 to 7 million years ago, the primates of today's primates, including our species, have done something new. When temporarily standing on two limbs so that with a bunch of fruits, this primitive man saw another cluster in a nearby tree and then began to drag there instead of using all four legs, dragging to the tree and then standing again. get up.

A number of reasons have been given to explain the development of activity on both legs, or walking on two feet. Now researchers at Washington University and Johns Hopkins University have built a mathematical model that shows that pear is the precursor to walking on two feet, which is a way to save metabolic energy.

Patricia Kramer, UW's anthropology professor, co-author of the study, said: 'The metabolic energy is generated by what animals eat, allowing it to move. But food sources are limited, especially for pregnant females because they have to take care of and nourish their babies. Finding food is vital, animals must use and save energy reasonably. '

She believes that large-sized stomachs, along with the need to save energy, are factors that motivate humans with pears in two feet.

Kramer said: 'Hungry. Always hungry. Nothing can make you do something you don't want out of food. That's why we lure animals with food to train them. '

Scientists have developed a model that shows that pear action, which appeared millions of years ago, as a precursor to walking on two feet, is also a way to save the meteorite's metabolic energy. Chief today.(Photo: iStockphoto)

There is a large gap in the Stone Age record that hides the time when humans separated from primates. Kramer and co-author Adam Sylvester, postdoctoral researcher at Johns Hopkins University, used chimp as a way to study the past while examining other researchers' ideas about origin. of operation with two legs. Chimp is the closest relative of humanity. Basically, they move with all four limbs, the body weight puts a part in the knuckles.

Kramer said: 'The body of chimpanzees is very similar to the ancient apes, our ancestors could have chimpanzee-like bodies. Other modern people are longer legs and larger heads. So chimpanzees are a good starting point. '

Using the patent model, Kramer and Sylvester calculated that for a chimpanzee, using two legs to move a distance of more than or equal to 50 feet is not effective for metabolism. But it will be more efficient with distances shorter than 30 feet. Most pear action appears at this distance. In addition, walking on two feet can be used most often with distances shorter than 3 feet.

She said: 'This is a predictable prediction. We rarely see a chimpanzee moving in an upright position at a long distance. The fact that a chimpanzee moves a short distance and then returns to a posture with 4 limbs will not happen. We can see this through children's learning. If they go from the chair to the coffee table, they will walk on two feet. But if they move longer distances, they will bend down and crawl '.

'We think that metabolic energy is extremely important. But we have only obtained the initial information collected from the research. This model allows people to carry the physical characteristics of any primates, so researchers can change parameters for a certain species. '

The study is published in the American Journal of Physical Anthropology.