Simmah dah nah, Mr Gus
The OP was made as a joke.
....and While I dont know for sure, it may be that the small burrowing, hibernating mammals were already coexisting with the Dino's, and thats why they survived.
Its suggested Only 75% of creatures died from the meteor impact. That left 25% to carry on, just none of the larger land based reptiles.
Trump HAD the World, ", Trump saw our children, "
Trump saw a way to make a brighter day so he started giving
There was a choice he was making, he was saving our own lives
Its true he made a brighter day for you and me. --Trump WINS 2016
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