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Re: Dinosaurs to birds




On Thu, 21 Jan 1999 Dinogeorge@aol.com wrote:

> In a message dated 1/21/99 6:36:24 PM EST, Dwight.Stewart@VLSI.com writes:
> 
> << Or (somewhat alternately): birds were sufficiently derived (in some way) to
>  survive the KT extinction.  This is whether a bolide was the cause or just a
>  contributor.  Some evolutionary adaptation that was present in Cretaceous
>  birds, but not present in Cretaceous non-avian dinosaurs gave birds an edge
>  (in this case). >>
> 
> Could also have been sheer luck. We have no good handle on bird diversity
> during the Cretaceous, but if it was (as I think) quite high, then most of the
> birds were killed off, too, and the post-Cretaceous bird radiation would have
> stemmed from just a few (say 40-50) survivor lineages (out of, say, 500-1000).

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