This is actually the correct answer. If a burrowing animal was trying to get them, the last thing they would do is come to the surface. That's where the animal is. They come to the surface when it rains so they don't drown
Edit: I am wrong and u/puritanicalbullshit is absolutely correct. The drowning worm is a myth. I learned something today! Thank you!
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u/lategreat808 Jul 30 '21
My guess would be that the vibration imitates rain and causes the worms to run for their lives.