A remarkable discovery of ancient fish fossils has revealed a chilling and unusual pattern: Tharsis, a now-extinct genus of ray-finned fish, may have met its end in the same tragic way. Analysis of ...

In a river of western Brazil, an “armored” creature with bumpy lips swam through the “dark tea-colored” waters. Something ...

In a baffling show of generosity, killer whales across the globe are giving fish to humans—and scientists are racing to ...