A fossil from a seagull-sized winged reptile that lived millions of years ago was found in Arizona, and the creature has now ...

In the remote reaches of Arizona s Petrified Forest National Park, scientists have unearthed North America's oldest known pterosaur a small, gull-sized flier that once soared above Triassic ecosystems ...

Cryopreserved samples from 18 endangered Nuttall's scrub oak trees were added to the San Diego Zoo Wildlife Alliance's Frozen ...