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Re: Winged migration

On Wed, 23 Jul 2003 GSP1954@aol.com wrote:

> What I am wondering is where they got the figure of 80 million years 
> that birds have ruled the skies. Birds were present almost twice as long, and 
> abundant by the Early Cretaceous, but pterosaurs were still around 65 million 
> years ago. 

Pterosaurs were reduced to a very few niches by 65mya.  Diversity in all
but the largest size ranges was being diminished well before that
time.  Unwin says this, I believe.