JOHN BEATTY / SCIENCE PHOTO LIBRARY JOHN BEATTY / SCIENCE PHOTO LIBRARY
Marine iguana. View of the head of a marine iguana (Amblyrhynchus cristatus). These are the only truly marine lizards, spending much of their time in the water feeding on seaweed and algae near the shore. These are large lizards, with some individuals reaching almost two metres in length. They form large herds along the rocky coastlines of the Galapagos Islands, their sole habitat. Their numbers were once greater still, but the arrival of humans and their animals has led to a reduction in iguana numbers on the islands. Photographed on Fernandina Island, part of the Ecuadorian Galapagos Islands.
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