Here’s a little-known fact: those ubiquitous earthworms beloved by gardeners are not native to northern North America! That’s right, most native earthworms were wiped out by glaciers thousands of years ago, and today’s species hitched rides on the ships carrying settlers to the continent. The worms themselves don’t mind; they simply go about the long process of turning leaf litter and decaying material into useful soil. Slow is the word, though, as it can take many months for worm eggs to hatch and grow into adult worms. That smooth band on earthworms? That’s the sign a worm is an adult, and it’s also a clue about the worm’s anatomy, as the smooth band is always closer to the worm’s head.