Over 200 nonnative plant species grow in Grand Canyon National Park, about 80 of which are considered invasive ... I’d never heard the bird before, and I was surprised to recognize it instantly from ...

Fifteen years later, when Congress again refused to create a national park, President Theodore Roosevelt stretched the limits of the Antiquities Act and established the Grand Canyon National Monument.

The public lands surrounding Grand Canyon National Park contain high concentrations of uranium ore ... Manmade ponds containing uranium-contaminated water are left uncovered and used by native birds ...