Some are more efficient on two feet than four.
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References
Sockol, M. D., Raichlen, D. A. & Pontzer, H., et al. Proc. Natl Acad. Sci. doi:10.1073.pnas.0703267104 (2007).
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Buckley, L. This chimp is made for walking. Nature (2007). https://doi.org/10.1038/news070716-2
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DOI: https://doi.org/10.1038/news070716-2