A marine iguana sits on the bottom of the ocean as thousands of fish swim by in an unforgettable shot captured near the Galapagos Islands.
The isolated islands - famous for Charles Darwin's 1835 visit which shaped the great naturalist's views on evolution - are the only place in the world where marine iguanas live.
The unique creatures, described as 'imps of darkness' by Darwin, can feed peacefully underwater for up to half an hour, and dive to depths of up to 45 feet. The marine iguana is the only lizard with this ability. It's a graceful swimmer, but ungainly on land - and Darwin was revolted by their appearance when he visited the islands.