echidna, spiny anteater, anteater
['flatworm, platyhelminth', 'mongoose', 'fox squirrel, eastern fox squirrel, Sciurus niger', 'horned viper, cerastes, sand viper, horned asp, Cerastes cornutus', 'wallaby, brush kangaroo', 'koala, koala bear, kangaroo bear, native bear, Phascolarctos cinereus', 'iron, smoothing iron']