Haleakalā National Park has a lot of feral goats, pigs, and deer on their land. These free-roaming animals are detrimental to the native plants that live in Haleakalā National Park. They destroy the natural vegetation and it has even put plants like the Silversword on the endangered species list. The U.S Park Service has put up fences along the park's borders to keep the invasive animals away.