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Re: "Flight theory has legs"

Jaime A. Headden wrote:

  No one is suggesting birds could be quadrupedal -- or extant birds, in
any case (I made a clear distinction in my prior post).

Japanese shearwaters climb sloping tree trunks using both the wings and feet, all of which contact the trunk.

I think we can all agree that, if theropods did enter the trees prior to the advent of flight, then these first arboreal theropods would have been very ungainly tree-climbers. But they had to start somewhere.

Among extant mammals, tree-kangaroos are clumsy in the trees, and so are certain species of "flying" squirrel.


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