Although poor management of feral horses may pose an ecological and environmental threat in some parts of Australia, their management is made difficult by issues of feasibility and public concern. Currently, management attempts vary, as feral horses are considered pests in some states, such as South Australia, but not others, including Queensland. There is also controversy over removal of brumbies from National Parks. The primary argument in favour of the removal of brumbies is that they impact on fragile ecosystems and damage and destroy endangered native flora and fauna.