This stunning wallpaper shows Biscayne National Park in Florida. Biscayne protects a rare combination of aquamarine waters, emerald islands, and fish-bejeweled coral reefs.
Clownfish do a wiggle dance inside sea anemones, circulating oxygen-rich seawater to the anemones to help them breathe.
Most of the world's coral reefs could be in big trouble by the end of the century, or much sooner, a new report warns.
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