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appearance of flying raptors vs. flying squirrels

I have found various scattered info on the 'net about the time-line of 
hawks/eagles/falcons, but would like your more knowledgeable opinions.   Did 
flying raptors appear prior to the "flying" non-bat mammals - or do you think 
that the appearance of the raptors forced the flying mammals into a nocturnal 
life-style? [Of course, owls are still a problem for them.]