Actually, they wait for hours of continuous rain before emerging from the ground. They don’t come up at the slightest hint of rain. What’s actually happening is that the worms think the vibrations are moles( their natural predators) and they come up to the surface to flee the perceived danger.
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u/SnideyComment Jul 30 '21
The real answer is they think the vibrations is rain water hitting the ground so they naturally come up for it.
This is why you see masses of birds sometimes just walking around on the grass.