New study: The presence of cougars drastically lowers the risk of drivers hitting deer on the road

One of the world's most endangered mammals is way too trusting of humans. Chileans are racing to save it

One of the world's rarest sea turtles was found stranded 5,000 miles from home. He's finally on his way back

As climate change worsens flooding, some places are becoming 'sponge cities'