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I've got a decent patch of pretty visible scar tissue on my left hand from where I broke my fall on gravel after a badger decided to dart across the forest path right in front of me. I had 0 warning, that thing was going at top speed and it felt as if I had cycled into a big log. It seemed to have survived the impact somehow and sped off while I was still doubled over with blood everywhere.
TL,DR: fuck badgers.
Squirrels, it's squirrels you need to be cautious of. They have an unhealthy desire to dart back across the path of danger, even after initially avoiding it.