Hominids are people who lived 5-6 million years ago. The word "bipedal" means someone who walks on two feet. Humans are the only mammals that walk on two feet. In the video we saw I found out some theories about why did the early hominids begin to walk.
The first theory: Sociological influence on bipedals. There was an environmental change 5 million years ago that could have made the hominids stand up. Hominids lived in Africa. There were big grasslands and savannas. The hominids needed to go further and further every time to get food and it was easier to walk on two feet than on four because they wasted less energy. Also, the grass was too high and the hominids needed to stand up to see better.
According to the dietary influence theory, it was easier for the hominids to reach food from trees on two feet.
The sexual selection was important too. Standing in two feet made the male hominids more attractive. When female hominids had babies, male hominids needed to go and get food. If they walked on two feet, they could carry more things.
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