The term 'Harmless Lizard' can be broken down into two crossword solutions: GECKO (5 letters) and IGUANA (6 letters). Geckos are small lizards that are found in warm climates around the world. They have adapted to living in a variety of habitats, from forests to deserts. Iguanas are larger lizards that are native to Central and South America. They are herbivores and are known for their ability to climb trees. Both geckos and iguanas are harmless to humans and make popular pets.