Some, like Mosasaurus, grew over 50 feet long. These reptiles dominated marine environments, feeding on fish, ammonites, and even other mosasaurs. They went extinct at the same time as the ...

The cliffs and their “sky caves”.Credit: Later, as we walk through the Kali Gandaki riverbed over hundreds of glittering ammonite fossils, Sherpa tells us how locals believe Mustang became a ...