Is Arizona's most beautiful place an iconic red rock butte, a blue-green waterfall or an otherworldly cave formation? Vote in our stunning views poll.

At a remote bone bed in Arizona, researchers have unearthed North America's oldest known pterosaur, offering groundbreaking insights into the evolution of these ancient flying reptiles. What does this ...

Learn more about Eotephradactylus mcintireae, the oldest Late Triassic Pterosaur in North America that was about the size of sea gull.

Smithsonian researchers have linked discoveries within Arizona’s Petrified Forest National Park with a previously unknown ...