You asked:

Do crows ever make contact with perched or flying red-taileds?

I've seen them "make contact" with flying red-tailed hawks, but it probably
wasn't the crow's idea or plan. The hawk performed a sudden barrel-roll
maneuver and instantly transformed a persecutor into a meal which the hawk
then enjoyed while totally ignoring the frantic protestations of the meal's
former flockmates. Also saw a bald eagle pull this same trick. That was
REALLY impressive.

Dennis Rockwell
Kennewick, WA
dennis.rockwell at gte.net