The land flatworm looks like a piece of living ribbon. It is flat and slimy. Often it sports warning colours like bright orange or yellow stripes. This appearance deceives. It moves with an eerie, gliding motion. Microscopic hairs propel it. A layer of mucus aids the slide. Snails would be jealous. Do not be fooled by its gentle look. This is a ruthless predator. It hunts earthworms, snails, and slugs. The method is gruesome. It wraps itself around prey. Slime and digestive enzymes smother the victim. Softened tissues are sucked out. This efficient dining has made some introduced species a serious threat to New Zealand's native earthworm populations. They are wolves in sheep's clothing. Fragile in appearance. Apex predators in the micro-ecosystem. Reproduction is versatile. They are hermaphrodites. Sexual reproduction occurs. But they can also tear themselves in half. Each half grows into a new worm. This party trick makes eradication notoriously difficult. Picking one up with bare hands is ill-advised. The slime can be irritating. They are surprisingly sticky. A fascinating but unsettling reminder. Soft creatures can be deadly. Success stems from structural simplicity. There is no respiratory system. No circulatory system. Oxygen absorbs directly through moist skin. Damp environments are mandatory. The flattened body shape maximises surface area for gas exchange. It keeps them low enough to slip under rocks and logs. Native species often evolve striking camouflage patterns. These mimic leaf veining. They disappear on the forest floor. Introduced Australian flatworms differ. They sport bright warning colours. These advertise toxicity to predators. Birds and lizards learn quickly to avoid the orange-striped invaders. This gives them an edge over subtly coloured native species. Chemical defence combines with aggressive hunting. Asexual reproduction accelerates the spread. Interlopers move rapidly across the landscape. They occupy damp gardens. They hide under pots and logs. Compost heaps offer ideal conditions. They glide over surfaces on a carpet of slime. Silent hunters of the soil. Their presence indicates ecological change. An imbalance caused by human activity. Moving species around the globe has consequences. A harmless garden dweller in one country becomes a monster in another. No one told it otherwise.