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RE: Paired Eggs in a Dinosaur Indicate Biological Sex

And some 86 species in 16 "orders" of Neornithes... See Dinosauria 2nd ed,
p.670 by Padian and Horner, citing Welty 1979 "The Life of Birds" 2nd ed.
There's not just 1 typical neornithine reproductive anatomy, although a
single _functional_ oviduct is likely ancestral for the clade.

--John R. Hutchinson 

> -----Original Message-----
> From: Phil Bigelow [mailto:bigelowp@juno.com] 
> Sent: 14 April 2005 15:34
> That means *three* species of nonavian dinosaurs are known to have had
> dual oviducts