Humans are perfectly adapted for life on land, but what if evolution had pushed us back into the oceans instead? Over millions of years, our bodies could have transformed in dramatic ways to survive ...

Tadpoles see well underwater, but what happens when they become frogs and live primarily on land? Researchers at York University and several other institutions, curious about the answer, found the ...

A river dolphin, or “boto,” preens just below the water’s surface at dusk in the winning image for this year’s Underwater Photographer of the Year competition. The picture was taken in the Amazon, ...