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>Perhaps someone could say what a choana is too?

Sorry, let that one slip out. Internal nostril (the opening inside the roof
of the mouth at the other end of the nasal passage).  In mammals and our
ancestors, birds, and modern crocs it is far back in the throat; in most
other reptiles (including non-maniraptoriform, and non-spinosaurid,
theropods) it opens closer to the front of the mouth.

Thomas R. Holtz, Jr.
Vertebrate Paleontologist     Webpage: http://www.geol.umd.edu
Dept. of Geology              Email:tholtz@geol.umd.edu
University of Maryland        Phone:301-405-4084
College Park, MD  20742       Fax:  301-314-9661