eel
['horned viper, cerastes, sand viper, horned asp, Cerastes cornutus', 'common iguana, iguana, Iguana iguana', 'goldfish, Carassius auratus', 'nematode, nematode worm, roundworm', 'three-toed sloth, ai, Bradypus tridactylus', 'submarine, pigboat, sub, U-boat', 'guinea pig, Cavia cobaya']