Learn everything you can about worms. Red wrigglers for the compost heap. Gray earthworms for the garden beds. And watch out for the dreaded Artioposthia triangulata . If you find one, call your local Extension Agent immediately.
Worms create great soil.
They don't deplete the soil. Their castings are known as black gold. In contrast, a 7000-acre field of corn treated with chemical fertilizers and pesticides was found to not have any worms in it at all. Worm castings are the perfect pH for plants. Worms burrow deep and bring up trace minerals.