Shooting by trained marksmen is considered to be the most practical method of control due to its effectiveness. The NSW Department of Primary Industries believe shooting is the preferred method of population control as it does not subject the horses to the stresses of mustering, yarding, and long-distance transportation, all of which are related to 'capture and removal' methods. Horses that are only initially wounded from shooting are tracked and dispatched if they are in accessible, open country. Brumbie advocacy groups do not consider mountain shooting to be humane. Helicopter shootings allow for aerial reconnaissance of a large area to target the densest populations, and shooters may get close enough to the target animals to ensure termination. This method is considered the most effective and cost efficient means of control, but disapproval is high amongst those that believe it is inhumane. Organizations supporting brumbies argue that aerial shooting is unnecessary and that alternative population control methods have not been given adequate trials, while government officials express concern about the need to control rapidly growing populations in order to avoid ecological problems associated with too many feral horses in certain areas.