How do birds hear worms in the ground?

I was watching a bird on my lawn %26 watched him carefully listen to the ground, next he pulled out a worm
Answers:
i don't think they can hear them, they pat thier feet on the ground so the worms think it's raining so they come to the surface X

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They stamp on the ground so the worms come up

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Firstly baby cake you need to get a life. But this is the accurate answer.

It was a sunny Wednesday afternoon in 1837 when Dave, the leader of the Texan branch of American sparrows institution was sat aimlessly on a cliff top overlooking the Texas plains, when out of his eye he saw a bunch of scruffy Indians with their ears to ground 'listening' for the next incoming stage couch to rob, thus the idea was born.
True story, one of Dave's descendants told me when I was shooting pigeons out of my loft

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Great sense of hearing. If you can observe birds on the lawn at home, you will notice they usually turn their beaks forward towards the ground and flick their heads from side to side. This improves their ability to hear a worm moving below the surface.

Another bird trick is to hang around grassy busy round abouts on major roads. The rumble of the passing traffic causes worms to come to the surface for some reason.

The early bird catches the worm.

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with their eyes

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They feel the vibration.

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I was reading my bird book. The robin by sight see the earthworms and other insects they eat. It is by sight.