diamondback, diamondback rattlesnake, Crotalus adamanteus
['black-footed ferret, ferret, Mustela nigripes', 'echidna, spiny anteater, anteater', 'snow leopard, ounce, Panthera uncia', 'rule, ruler', 'barn spider, Araneus cavaticus', 'bighorn, bighorn sheep, cimarron, Rocky Mountain bighorn, Rocky Mountain sheep, Ovis canadensis', 'scale, weighing machine']