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Re: Theories on the extinction of dinosaurs

John Clavin wrote, in part:

>Especially for a group of creatures that don't adapt to changing
circumstances very well.>

That's an interesting thing to say about a group of creatures (dinosaurs)
that, at the time of KT extinction, had been around for 100+ million years
and that arguably constitute a major percentage of extant vertebrate

What is your evidence for claiming that dinosaurs did not adapt to changing
circumstances very well?