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Re: snout to beak

    Finally, beaks are apparently pretty easy structures to evolve, they
appear independantly in multiple groups of dinosaurs, synapsids, etc.


  To whit:

Lee, M.S.Y. 1997. The evolution of beaks in reptiles: a proposed evolutionary constraint. _Evolutionary Theory_ 11:249-254.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jerry D. Harris
Dept of Earth & Environmental Science
University of Pennsylvania
240 S 33rd St
Philadelphia PA  19104-6316
Phone: (215) 898-5630
Fax: (215) 898-0964
E-mail: jdharris@sas.upenn.edu
and     dinogami@hotmail.com

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