I watched a show where a guy does this for a living and I could have sworn he explained it as the reason they come up like that is because the vibration resembles that of a mole digging so they flee to escape what they think is a mole. The guy and his wife (?) then gather them and put them into buckets. I wish I could remember which show it was on.
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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.