A possible ecological scenario for the evolution of bipedalism is that increasing aridity lead to deforestation and the need to travel long distances to find fruit.

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As forests became scarcer due to increasing aridity, hominids may have had to travel long distances to find food such as fruit. This would have selected for those individuals with efficient bipedalism as it would have been more energy-efficient than quadrupedalism for covering long distances on the ground. Therefore, bipedalism would have given an evolutionary advantage and eventually became the dominant mode of locomotion in hominids.

A Possible Ecological Scenario for the Evolution of Bipedalism Is