Brumby is causing several environmental damages, increasing an unaffordable to the Australian ecosystem. They interrupted the normal balance of the high-country Eco-system and cause difficulty to other species to survive.
Like the other ordinary horses, brumbies will dig a hole that trampling and pugging the remnants of moss done by the hooves. And they often travel along the same path, that indicates the damage has been done repeatedly. The force of travelling impacts on the ground will an irreversible damage to the high-country grassland. The soil cannot hold water anymore, the plant and vegetation are hindered. That which leaves the grassland not too useful to the other purpose as a result of fall into disuse, also increasing wildfire risk.
Due to the excessive increase of the wild horse, the natural resource has been heavily consumed by the brumby. because of one of the attribute “smartness”, brumby will select the best and most suitable spring sites and stay there until the resource totally running out. An adult horse will drink between 15 to 35 litres of water per day, the intake may vary depends on their daily activities and temperature. On the other hand, brumby likes to eat aquatic vegetation and macroinvertebrates to main the body hydrant level. The large consumption of mayflies, caddis flies, snails and leeches by feral horse leaves water food resource for the birds and ducks and place them in an endangered environment.