Pygmy Sea Horse and Coral
Photograph by Paul Sutherland, National Geographic
Coral polyps are transparent, not colorful, yet coral reefs abound with vibrant hues. The color comes from algae, which lends reefs the tropical colors most associate with these lush landscapes. Reef species like this pygmy sea horse adapt to their colorful environment by donning their own vivid hues. Both hunter and hunted use color for camouflage on the reef.
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