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Re: Third claw for climbing was Re: Pro(to)avis

Not much. The claw has a cutting edge. That's quite precisely what I wouldn't
use for climbing...

[...] in how many forms? All, including Rahonavis?

AFAIK... yes, all. Definitely including *R.*.

But then *R.* has the toe bone proportions of a ground-dweller. *Archaeopteryx* is just on the terrestrial side of the line between terrestrial and arboreal birds in this respect...