Although they cover only one percent of the Earth's surface, reefs are home to more than 25 percent of all marine fish species. They are the largest living structures on the planet, created over millennia by countless tiny organisms. Reef is your opportunity to discover some of the most incredible wildlife habitats on the planet. Coral reefs are often called "the rainforests of the sea" because of the quantity and diversity of life they support, and because they are highly sensitive and threatened ecosystems. Building on the success of DK's "Rainforest," this unique pictorial celebration of the world's reefs progresses through an ecological chain that goes from algae, sponges, and mollusks to the thousands of fishes that make their homes there. This vivid collection of photographs, from underwater photography collective Scubazoo, reveals reefs as they've never been seen before.