The Lizard, also known as IGUANA in the NES version, is an enemy in the original Final Fantasy. It is a challenging enemy if your party has not been sufficiently trained up, but if the player has trained them properly, they should have no problem killing this beast.
It was called IGUANA in the NES version. Iguana is a genus of herbivorous lizards native to tropical areas of Mexico, Central America, several islands in Polynesia and the Caribbean. Two species are included: the green iguana widespread throughout its range and a popular pet, and the Lesser Antillean iguana native to the Lesser Antilles and endangered due to habitat destruction. The word "iguana" is derived from the original Taino name for the species, iwana.