There are several species of ground squirrels found in Montana and they can be serious problems. All are small, burrowing rodents and the control methods are the same. You need to make sure that you have ground squirrels and not pocket gophers, as control is different. Pocket gophers spend a good deal of time underground creating extensive burrow systems and mounds of dirt above ground. Ground squirrels are burrowers too, but do not leave the mounds of dirt. If you are using lethal methods make sure that you are targeting ground squirrels and not the white-tailed prairie dog, which is protected in Montana.