[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: A few more...



>From: Dinogeorge@aol.com
 > In a message dated 95-09-29 13:20:48 EDT, Thomas_R_HOLTZ@umail.umd.edu (th81)
 > writes:
 > 
 > >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.
 > 
Actually, given the limited knowledge we have of dinosaur embryos,
we cannot rule this out in the case of basal dinosaurs vs. sauropods.

I do not find the reversal required there to be all that impossible.

swf@elsegundoca.attgis.com              sarima@netcom.com

The peace of God be with you.