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Re: tiny theropod on a tree trunk question

David Peters wrote:

One of the minor/major differences in bats and colugos (or colugoes in a
nod to Dan Quayle) is a preference for one or the other (and remember
we're talking about tree trunks, not horizontal branches here) with a
posterior/lateral rotation of the resting carpus in one and not the

It seems much more likely that the posterior orientation of the carpals in birds, bats and pterosaurs is related to selection for increased aerodynamic thrust than to any specific orientation when grasping onto vertical surfaces. Posterior/lateral rotation of the carpus is a characteristic of all 3 of those groups, and is absent in all groups of tetrapod gliders, such as Colugos and the many types of flying squirrel.