horned viper, cerastes, sand viper, horned asp, Cerastes cornutus
['platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus', 'trilobite', 'mongoose', 'ptarmigan', 'axolotl, mud puppy, Ambystoma mexicanum', 'prairie chicken, prairie grouse, prairie fowl', 'echidna, spiny anteater, anteater']