There are only three reptiles in the whole book, and I chose Iguanas to be in here because if you’re going to have lizards in a book you can’t not mention the Iguana. Iguanas are the quintessential lizards. Scaly and peaceful, these lizards are found in many habitats. There are both land and marine iguanas! One of the identifying features of iguanas are the large spikes that go down their backs. Like most reptiles iguanas are cold blooded and rely on external temperatures to regulate their internal body temperature. As a result, you can often find them sunning themselves on rocks.