Marine Iguanas turn vivid colors when breeding, and this particular rock seemed to be a good place for many such iguanas to congregate at one time. I moved my camera low, and photographed them moving very slowly towards me with a short telephoto lens. There is a surrealistic strangeness to this scene -- it reminded me a crude 1950s monster movie, yet the moment was real and unforgettable. There we thousands of similar iguanas warming on these rocks. Young marine iguanas are vulnerable to predation -- frigatebirds, hawks, herons and snakes can take them at will, as well as feral cats and dogs. In the water, the young iguanas fall prey to Moray eels. Once mature, however, the only real predators of Marine Iguanas are hawks, cats, and dogs.