The Nungara flatworm (Obama nungara) has the best conditions to develop into an invasive species without predators in Germany. The carnivorous predator feeds on earthworms, snails and other flatworms, among other things.
Since the flatworm tastes too bitter even for predators such as birds or hedgehogs, it can reproduce particularly well. The worm is around seven centimeters long and up to five millimeters wide. It has a golden yellow basic color with numerous brown dots. The abdomen of the very flat worm is white-gray. Even though the worm has a slimy back and likes moist habitats, unlike the similar leech, it is clearly a land animal, according to a research report in the science magazine Biology in Our Time. Anyone who finds such a brown flat worm should capture the animal with tweezers, photograph it and kill it in a container with soapy water. You should also report the animal to the German Nature Conservation Association or via the specialist portal “iNaturalist”.