What I discovered left me even more unsettled. This wasn’t a worm at all, but a terrestrial flatworm known as a hammerhead worm, an invasive land planarian that preys on earthworms and quietly disrupts the soil beneath our feet. Its smooth, gliding movement comes from a carpet of microscopic hairs and a layer of mucus that helps it slip across surfaces like a living shadow.
The strangest part is how easily we overlook creatures like this, even as they reshape the tiny ecosystems we rely on. Hammerhead worms can contain toxins, and experts advise against touching them with bare hands or trying to crush them, since fragments can regenerate. Standing there that morning, watching it disappear into the damp earth, I realized how little we truly know about the lives unfolding just a few steps from our own front doors.
