sturgeon
['porcupine, hedgehog', "plunger, plumber's helper", 'slide rule, slipstick', 'stinkhorn, carrion fungus', 'chiton, coat-of-mail shell, sea cradle, polyplacophore', 'chambered nautilus, pearly nautilus, nautilus', 'Komodo dragon, Komodo lizard, dragon lizard, giant lizard, Varanus komodoensis']