The habit of standing and walking on two feet; the state of being bipedal(noun)
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Use "bipedalism" in a sentence
"In his book The Hunting Apes: Meat Eating and the Origins of Human Behavior, anthropologist Craig Stanford of the University of Southern California brings to attention the chief differences between humans and chimpanzees, namely bipedalism and larger brain size in humans."
"All it did was change the background narrative by implying that we did not evolve bipedalism as a mechanism of looking up over the tall grasses."
"Other's have noted these differences and taken them out of context, one going so far as to publish a news article in Al-Jazeerah titled something along of the lines of "Ardi proves Darwin wrong" (google it) – as if the idea that we got one hypothetical detail in a potential mechanism for the evolution of bipedalism wrong somehow refutes the entire Theory of Evolution."