Rangiroa is a laid-back island paradise full of underwater wonders, including abundant sharks. It's the largest coral atoll ...

Decades of citizen science in Alaska helped researchers figure out how one of the biggest wildlife die-offs -- that of the seabird the common murre -- unfolded.

Scattered across the U.S. are islands where animals have adapted in ways found nowhere else in the world. From isolated predator-free zones to unique ecosystems shaped by evolution, these seven ...