ptarmigan
['Gila monster, Heloderma suspectum', 'whiptail, whiptail lizard', 'robin, American robin, Turdus migratorius', 'black-footed ferret, ferret, Mustela nigripes', 'spiny lobster, langouste, rock lobster, crawfish, crayfish, sea crawfish', 'cliff, drop, drop-off', 'rule, ruler']