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At 09:05 PM 01/11/1999 -0800, you wrote:
>Why do you say unequiviocally that only advanced birds have pygostyles?
If by "advanced bird" you mean Neornithes, the statement is clearly wrong.
If you mean "anything higher than Archaeopteryx" the statement is (barring
the new oviraptorian) correct.
Ronald I. Orenstein Phone: (905) 820-7886
International Wildlife Coalition Fax/Modem: (905) 569-0116
1825 Shady Creek Court
Mississauga, Ontario, Canada L5L 3W2 mailto:firstname.lastname@example.org