DOUG ALLAN / SCIENCE PHOTO LIBRARY DOUG ALLAN / SCIENCE PHOTO LIBRARY
Marine iguanas (Amblyrhynchus cristatus) basking on rocks. This is the only truly marine species of lizard. It spends much of its time feeding on seaweed and algae near the shore. Because the waters it inhabits are cold, it basks in the sun to raise its body temperature. It is a large lizard which can reach up to two metres in length. It is only found along the rocky coastlines of the Galapagos Islands. It used to exist in vast colonies, but its numbers have declined recently due to the unusually strong 1982-83 El Nino climate event and the impact of introduced predators such as rats and cats. Photographed in the Galapagos Islands.
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