Something unusual is happening in the Grand Canyon—its animals are behaving in ways never seen before. From unusual migrations to altered feeding habits, experts are searching for answers.

Groundwater pollution has the potential to seep into underground aquifers used for drinking water and into seeps and springs that are the lifeblood for animals in the arid Grand Canyon region. The ...

Layered rock formations The Grand Canyon is a geological marvel ... the bottom to ponderosa pines and aspen trees on the rims. Wildlife includes California condors, mule deer, and bighorn sheep ...