sea slug, nudibranch
['coil, spiral, volute, whorl, helix', 'acorn squash', 'rhinoceros beetle', 'sandbar, sand bar', 'frilled lizard, Chlamydosaurus kingi', 'platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus', 'hammerhead, hammerhead shark']