It’s autumn at Atlas Obscura headquarters in New York City, and we’re lucky enough to be enjoying crisp weather, peak foliage and bars that serve warm drinks. But when we look down at the ground, we worry.

What’s going on in there? If movies are any guide, quite a lot. There are worms of a variety of sizes and temperaments just below the surface, waiting for their chance to see the light of day. To help readers sort the cute subterranean beasts (think Labyrinth) from the truly deadly varieties (think all five Tremors) , we have ranked them by size in the video below. Enjoy!