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<<This is still somewhat debated. Personally, I think the evidence
favors some remnant of arboreality in early hominids.>>
As do I.
<<As has been pointed out, arboreal primates are arboreal quadrupeds.
However, the great apes are very specialized arboreal quadrupeds, called
brachiators. That is, they have *greatly* elongated arms they use to
swing from branch to branch. (This specialized form of locomotion,
complete with elongate arms is found convergently in the new-world
spider monkeys as well).>>
This is what I figured, I didn't speculate on it further because I
couldn't remember the brachiators from the non-brachiators.
<<Bipedal archosaurs all have a more typical "horizontal" bipedality.
The origin of this is likely to be quite different.>>
<<In the case of hominids, it was due to the overly long arms, derived
from their unusual use in locomotion.>>
This is what I think.
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