The marine iguana (Amblyrhynchus cristatus) inhabits the Galapagos Island, an archipelago on the Equator, 800 kilometers west of the Ecuadorian coast. It differs from the mainland iguanas by the shape of the snout and other morphological features. The species probably rafted to the islands many millions of years ago, and developed a new ecological niche.They feed almost exclusively on marine algae and seaweed in the intertidal zone, and some make shallow dives past the breaker zone.