Rolling through the back of the Vassar Campus, watching a murder of crows on the lawn, when all of a sudden:

That squirrel passed about three feet in front of Mary’s bike, running flat out and, at 60 frame/s, touched the ground every 200 ms:
Figuring a squirrel body+tail is 1.5 ft long and it covers 3 of those units with every leap, it’s moving at 22 ft/s = 15 mph. That’s about as fast as we travel…