IN THE DEEP Healthy shallow reefs, like this one in Micronesia, are at increasing risk. Researchers previously hoped that species from these reefs could survive in deeper reefs, but new evidence shows this may not be the case.
L.A. Rocha/California Academy of Sciences
WILD WASTE Nitrogen from the guano of seabirds, such as this red-footed booby chick, leaches into coral ecosystems and helps them stay robust.
GOING THE DISTANCE Painted ladies travel 12,000 km each year, farther than any known butterfly migration.