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Re: Yet more on pterosaur quad arm posture
> We agree that animals that are not scansorial do roost in trees.
...if they can fly there. (WAIR probably counts, too.)
If they climb there instead -- if they do what practically no bird ever does
today: start on the ground and climb into the crown --, they're scansorial:
natural selection for climbing ability kicks in, and they evolve adaptations to
Lots of terrestrial or semiaquatic birds roost in trees _because_ they can do
so without climbing.