WASHINGTON — Federal officials said Thursday they are trying to determine whether a wolf-like animal that has been repeatedly spotted in an area north of the Grand Canyon is an endangered gray wolf, ...

A group of visitors to the Grand Canyon sparked ire when they were filmed getting up close and personal with a grazing elk. The video of them, titled "Tourons at the Grand Canyon," amassed nearly ...

The Grand Canyon is known as a world-renowned tourist destination for its breathtaking vistas and outdoor adventures. But within the striated canyon walls, a hidden world of microscopic marvels ...

The Grand Canyon may rewrite the textbooks on the Cambrian Explosion—a key turning point in Earth's history when there was a sudden boom in complex life and the emergence of all the major animal ...