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Re: Dinosaurs vs. Therapsids
In a message dated 5/16/01 10:47:39 AM Pacific Daylight Time,
The end-Permian extinction was the main blow. They [non-mammalian
therapsids] were able to rediversify somewhat, but other reptile groups
were more successful in recovering and competing with them. And they also
had the added pressure of competing with their own descendants (mammals)
beginning in the Upper Triassic.
Well, I suppose, but the earliest mammals were probably not very different
from other highly derived therapsids--all were most likely small, hairy,
endothermic, and oviparous.