I have taken many pictures of green iguanas, my favorites, but also I work with iguanas negras (black iguanas in english), they are much more temperamental tha the green iguanas, maybe because they are omnivores, while the green iguanas are herbivores. Anyway, this is an small male that we keep in a wooden confinement, usually he doesn't get near the glass, and he runs away when somebody pass near, when I took this picture he was pretty calm just at the side of the glass.