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Re: Dinosaurs to birds



John Bois wrote (about the K/T transition):

>Then how do you explain the disappearance of enantiornithines?  More bad
>luck? 

This is analogous to the survival of the pterodactyloids and the extinction
of the "rhamphorhynchoids" at the J/K boundary. In each case, the dominant
volant vertebrate group died out and was replaced by another group. As to
why this is so, we don't know. It would be simplistic to say that
neornithines and pterodactyls were superior to enantiornithines and
"rhamphorhynchoids," respectively.


Raymond Thaddeus C. Ancog
Mines and Geosciences Bureau
Philippines