"It was the top predator; that was its place in the food chain. There was none bigger or more dangerous than it." ...

Desert tortoises have lived in the deserts of California, Arizona, Nevada and Utah since the Pleistocene. In the early years of the 20th century, they still thrived within the Southwest's arid ...

Despite its intimidating name, Moloch horridus, better known as the thorny devil, is actually a small desert lizard found in ...

The aquatic reptile, a superpredator of the mosasaur family, inhabited the seas of what is now the northeast of the country ...

A skull found 25 years ago in northern Mexico has led to the definition of a new species of marine reptile, scientists ...

Scientists found a “robust” creature with porthole-like spots in a desert of Australia and discovered a new species, a study said. Photo from Peter McDonald via McDonald, Fenner, Torkkola and Oliver ...

This article originally appeared on Inside Climate News, a nonprofit, non-partisan news organization that covers climate, energy and the environment. Sign up for their newsletter here. Gila monsters ...

Scientists discovered troubling news about the Gila monster, one of the most beloved reptiles in the Southwestern United States. A warming climate could make it much harder for them to survive, ...

PHOENIX — Fossils from the Petrified Forest National Park, in northern Arizona, revealed a new reptile species that thrived during the Triassic Period. Paleontologists and partners with the ...