It also implies that mammals were able to out-compete dinosaurs in niches to which they were already adapted; and that is interesting.
Indeed it is. Perhaps us mammals don't have as much to thank the KT asteroid for as we think...
So the article is being a bit sensationalist, as whilst these findings call certain ideas about evolutionary *history* into question (when mammals began to diversify) they don't have any impact on the underlying theory.
Odds on that this quote will be haunting us for years, though...
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