I ran over a rattlesnake a couple years back on the American River Trail near Sacramento, on my road bike. Happened too fast to bunnyhop, and I didn't want to stop and find out how the critter made out. It did make a hissing sound as I rolled over. Still feel badly about damaging wildlife.
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"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.