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dkysh t1_iuy6std wrote

https://en.wikipedia.org/wiki/Paranthropus_boisei#Postcranium

> Unlike P. robustus, the arm bones of OH 80 are heavily built, and the elbow joint shows similarities to that of modern gibbons and orangutans. This could either indicate that P. boisei used a combination of terrestrial walking as well as suspensory behaviour, or was completely bipedal but retained an ape-like upper body condition from some ancestor species due to a lack of selective pressure to lose them.

Although this "suspensory behaviour" doesn't need to be brachiation, Gibbons have exceptional upper body strength as an adaptation to brachiation as a locomotion mode: https://onlinelibrary.wiley.com/doi/full/10.1111/j.1469-7580.2009.01109.x

So, no idea, but could be possible. Depends on your definition of strength.

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