chiton, coat-of-mail shell, sea cradle, polyplacophore
['ruffed grouse, partridge, Bonasa umbellus', 'ear, spike, capitulum', 'tiger beetle', 'alligator lizard', 'echidna, spiny anteater, anteater', 'axolotl, mud puppy, Ambystoma mexicanum', 'red-backed sandpiper, dunlin, Erolia alpina']