Saving big cats comes down to money. And now scientists have some.

Corals can alter their skeleton to match the changing chemistry of seawater, making them the only known animals to achieve such a feat, according to a new study.

An area off Alaska is designated as critical habitat for the most endangered whale in the world.

Those in favor of simplified spelling say children would learn faster and illiteracy rates would drop. Opponents say a new system would make spelling even more confusing.

Drops of water reveal the age of the tallest mountain range in the continental U.S.

32.5 percent of the 5,743 known species of amphibians are currently threatened.