I've only hit two animals - a squirrel and a goose - and both survived. I regularly see groundhogs, rabbits, geese, and deer on the MUP commuting and even the occasional wild turkey. On my evening rides the deer are more plentiful and more reckless. I had a doe stare at me last week as I approached her and got within 10 ft before she decided it was a good idea to leave the path. They pop out of the brush on the side sometimes and that's really unnerving. There are stretches that I know not to go too fast because of the deer.
Lately I've been being bombarded by birds and cicadas. Hit two cardinals this week - just bumps so neither were hurt. Yesterday a cicada hit my shoulder HARD. It hurt but at least I had the satisfaction of hearing the bugger's last screech as he hit the pavement!
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There are no tailwinds. There are headwinds and days when I'm awesome!