Re: More on Argentavis

[David Marjanovic <david.marjanovic@gmx.at>]

> I'm not sure, but small bats don't seem to do it;

Pollinating bats do it. While they can't rotate the wing as a whole at the 
shoulder joint the way a hummingbird does, they can, like us, twist 
(supinate) the forearm, rotating most of the wing.