I've hit a small doe once with a 90 Accord (broke headlight/dented fender) and had some large deer headbutt the rear driver's quarter panel of my 96 GL while doing 50MPH (must have been a doe due to no damage there, needless I went sideways and straight into the opposite ditch, no damage to the Contour). Had a close call while delivering pizza in the GL, saw the deer running and slammed on the brakes... would have nailed them if I braked any later.
Coming back here after going home for the holidays I would have hit 2 deer that were in the left lane (good thing I was in the right) in Wyoming. Not too long after that in Montana I saw a buck with a huge rack(?) standing in the median watching me go by.
They told us not to swerve or slam on brakes here (unless it's something like a moose) and just hit the animal, otherwise may end up in the ditch and possibly more damage than just hitting them. Of course this was for gov't vehicles, though.