What distinguishes hominins from all other species?

Hominins are distinguished from all other species primarily by their ability to walk upright on two legs, a trait known as bipedalism. This adaptation is significant not only because it frees up the hands for tool use and manipulation but also because it changes the overall structure and function of the pelvis, spine, and legs. The development of bipedalism is considered a key milestone in human evolution, allowing our ancestors to traverse varying terrains more efficiently and with better visibility over long distances.

Walking upright also has implications for social and environmental interactions, as it enables different modes of locomotion and the ability to carry objects. This capability contributed to the evolutionary pathways that led to the emergence of complex behaviors, tool use, and ultimately, the development of language and culture, which are characteristics of later hominin species. Thus, the ability to walk upright on two legs is a fundamental aspect that sets hominins apart from other species.