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Slimy iridescent flatworm with a hammer head. The predatory land planarian is no friend of earthworms. In fact, they are parasites that eat earthworms and can wipe out entire populations. It can stretch out up to 20 inches long, gliding along on a layer of mucus secreted from glands along its underside. This gruesome worm feeds by extending its throat out of its mouth and into the earthworm. Small bits of the earthworm is swallowed a little at a time.