Originally Posted by uncle uncle

Per the interwebs, butterflies can fly at speeds between 5-12 mph. 1 mph = 63360 in/per hr. An hour is 3600 seconds. So dividing 63360 by 3600 gives you an equivalent rate for 1 mph of 17.6 in/sec. 17.6 X 5 (factor of speed)= 88 in/sec; 17.6 X 12 (factor of speed)= 211 in/sec. A standard butterfly is 2" long, so he could cover that 2" distance in 2"/88" per sec or .022 seconds (at a rate of 5 mph) or 2/211= about .01 seconds (at 12 mph rate).

A bicycle traveling at 10 mph, with a 700c size wheel makes 123 rev/minute, or 123/60= 2.05 rev/sec. In .022 seconds (slow butterfly) that wheel makes .045 revs, or 16.2 degrees of revolution ; in .01 seconds (fast butterfly) makes .021 revolutions or 7.5 degrees of revolution.

Yeah, I think he could squeeze through... but, to answer your question, "no, I've never seen it".