You don't need to be on a bike to have encounters with squirrels. I surprised one at work the other day, as I walked up a short flight of concrete steps to an open external door. A sand-filled fire bucket was being used as a doorstop and the squirrel was sitting in the bucket on the sand. Suddenly it launched itself up in the air and landed on my shoulder, pausing for a moment before running down my back and scurrying away. It's bushy tail was twitching inches away from my face, so I hope it wasn't carrying any fleas!I'm with Ming, squirrels. Not convinced they don't work together and celebrate if they down a cyclist.