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Name: smoke
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Date: Around 1993

How earthworms move in soil? Do they eat the dirt? Push it away? What?

Earthworms eat stuff that is in the dirt, and what they excrete out the other end is actually what we call dirt, in many cases. So in a sense, they make dirt. But that is not how they move. Earthworms have little barbs sticking out of their bellies, which can point either forward or backwards, and they have muscles which contract the whole body lengthwise. If the barbs point backwards and the body contracts, the worm moves forwards, and the other way around. It is like if you grab onto something with you hands when you are lying down and scrunch up your body, you will move forward, toward your hands. If you leave your hands free and hook onto something with your feet and scrunch up your body, you will move backwards.


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