The predominant naturally-occurring vegetation on the Monument is composed of the sagebrush steppe plant communities once common to much of the intermountain region of southern Idaho.
Livestock grazing prior to establishment of the Monument in 1988 also undoubtedly contributed to alteration of soils, loss of native grasses, and establishment of non-native plant species.
Did You Know?
The zebra-like horse fossil Equus simplicidens was originally named Plesippus shoshonensis by Dr. Gidley, Smithsonian paleontologist, who led the 1929 excavation at Hagerman. He felt the fossil was different enough to represent a new species distinct from any other fossil horses.