We saw two species of Iguanas, Green and Black. I did some research on the Internet, but I couldn’t find a clear description of the differences between them. I would be happy to hear any tips you may have for me. However, based on Internet photos, I think these two pictures show the differences. I think the one on the left is a Black Iguana. It has a longer, more pointed head. It also has two black stripes behind its eye, although the upper one is more prominent. The photo on the right shows a Green Iguana with its most noticeable identifying feature being the large “scales” on the lower extension of its jaw.