The other day I moved some carpet scraps in a plastic bag that had been sitting on concrete. With the rain there was plenty of water and moisture there. Against the concrete wall was the largest earthworm I have ever seen. At first I thought it was a salamander, but wait, where are the legs?
This earthworm was at least 6-8" long and perhaps 1/2" wide.
We don't use artificial fertilizers and limit tilling of the soil.
Here is an interesting link to learn more about earthworms...
https://www.backyardnature.net/earthwrm.htm