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Re: Why did small dinos become extinct?

If, indeed, there was a difference in metabolism in
the two groups.

Come on :-)

The K/T extinction seems to have been more biased
ecologically, than physiologically.

Don't squamates (mosasaurs excepted) show better survival than mammals?

Based on the very small sample size, most amphibians seem to have survived, too, though of course many of them were semiaquatic or aquatic; freshwater ecosystems mostly don't depend directly on green plant parts -- which is why more crocs didn't die out.