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The marine iguana (Amblyrhynchus cristatus) is endemic to the Galapagos Islands and is the only lizard on Earth that spends time in the ocean. Though it feeds in the water, it is predominately terrestrial. In the water, it swims with a snake-like motion and holds itself against the bottom with its long claws in order to graze. Marine iguanas sneeze frequently to expel salt from glands near their noses. The salt ends up hitting the top of its head and back, which explains the yellowy/white residue on its head. As the marine iguana is cold blooded, its black skin helps absorb heat from the sun so it can dive into the cold ocean.
Galapagos marine iguanaGalapagos marine iguana