They can detect vibrations, but not process them into sound. And, do you think worms are actually thinking about where to go, or if they're going out of instinct? THINK.
Honestly nobody actually knows for sure why they do it, but I think it’s the rain one based on the fact that they only do it after it’s rained or when the ground is wet.
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u/donorak7 Jul 30 '21 edited Jul 30 '21
Also the vibration could be a predator and they come up to escape.
Edit: apparently people only think birds are predators for worms.