How has the replacement of bison with cattle on the prairie impacted the ecosystem? 

How has the replacement of bison with cattle on the prairie impacted the ecosystem? Prairie chicken habitat has been reduced and the species is considered endangered. There has not been an impact because bison and cattle both graze on grass. Cattle have encouraged wolves and grizzlies to return to the prairie. Cattle graze on less grass and prairie grass growth has therefore increased. The loss of bison has increased the eagle population.