Hitting animals in my car always makes me feel like poo, thankfully its been pretty rare. Ive hit exactly three things, 1) a bird that didnt fly out of the way fast enough. 2) A turtle in the middle of the road I thought I could avoid by repositioning my car to let it go down the center. 3) A cat that shot out of some bushes. Actually, the cat hit me on the side of the car and in my side view mirror I saw it roll away, get up and tear off back into the bushes.
EDIT: Oh, and I almost hit a deer once. Not just any deer but what seemed like the father of all deers, standing all gigantic in the middle of the road, smirking and unmoving as I locked up the tires and skidded past him in the wrong lane. Stupid giant deer.