By the late 1880s, the huge herds of bison had virtually disappeared.

Huge herds of ceratopsids roamed the floodplains alongside equally large groups of hadrosaurine and lambeosaurine hadrosaurs.

Huge herds of elk, bighorn sheep, and mountain goat roam the region's rugged peaks, big river valleys, large meadows, and vast coniferous forests.

In the smaller, wilder stretches of a river, rafts couldn't get through, so masses of individual logs were driven down the river like huge herds of cattle.