Grand Canyon researchers are sounding the alarm after invasive crayfish numbers climbed sharply downstream of the Glen Canyon Dam, with worries that the species could reach some of the Southwest's ...

A pair of biologists, one with West Liberty University, the other with Arizona State University, both in the U.S., has found evidence that challenges theories surrounding bright coloration always ...

Crayfish are the latest non-native species invading the Colorado River below Glen Canyon Dam, threatening to spread into the Grand Canyon. The species has proliferated around the West, causing ...