On a group ride and after a turn we were just getting up to speed, maybe 20mph, and I was following a woman when a squirrel darted from the bushes and into her front wheel. She screamed and the squirrel just bounced off and went back into the weeds. I was very impressed by her ability to stay in control, if she had fallen several of us would have gone with her. She was upset until I assured her the thing survived.
Another time I was descending a mountain road and my wife and her friend were behind me. We were doing at least 35mph and I heard a blood curdling scream from the wife's friend. Turns out she hit a squirrel and it did not live to tell the tale. Again, she kept it under control while speeding down a narrow, twisty road.