The foundational behavior of Hominini was:

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Bipedalism, or the ability to walk upright on two feet, is considered the foundational behavior of hominins (species of humans and their extinct relatives). This trait is believed to have developed around 6 million years ago and paved the way for many other adaptations that set hominins apart from other primates, such as the ability to manipulate objects with their hands and the development of larger brains. While tool use, hunting, and speech are all important behaviors that distinguish humans from other animals, bipedalism came first and was a key factor in the evolution of our lineage.

The Foundational Behavior of Hominini Was