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Re: A few more...

In a message dated 95-09-29 13:20:48 EDT, Thomas_R_HOLTZ@umail.umd.edu (th81)

>Much in the way that the hoatzin "magically regained" functional unguals?
>Reversals happen.

Birds never really "lost" functional unguals, since these are expressed in
most avian embryos. Hoatzin juveniles retain them until adulthood, when, as
in all good birds, they are subsumed into the wing.