armadillo
['chiton, coat-of-mail shell, sea cradle, polyplacophore', 'electric ray, crampfish, numbfish, torpedo', 'hornbill', 'American coot, marsh hen, mud hen, water hen, Fulica americana', 'bighorn, bighorn sheep, cimarron, Rocky Mountain bighorn, Rocky Mountain sheep, Ovis canadensis', 'chambered nautilus, pearly nautilus, nautilus', 'African grey, African gray, Psittacus erithacus']