Yosemite National Park is causing the problem. Despite the richness of high-quality habitats in Yosemite, the brown bear, California condor, and least Bell's vireo have become extinct in the park within historical time, and another 37 species currently have special status under either California or federal endangered species legislation. The most serious current threats to Yosemite's wildlife and the ecosystems they occupy include loss of a natural fire regime, exotic species, air pollution, habitat fragmentation, and climate change. On a more local basis, factors such as road kills and the availability of human food have affected some wildlife species. Yosemite National Park has
Yosemite National Park The cavalry left another legacy in the park, the ranger hat. From 1899 to 1913, cavalry regiments of the Western Department, including the all Black 9th Cavalry (known as the "Buffalo Soldiers") and the 1st Cavalry, stationed two troops at Yosemite and brought with them the trooper's campaign hat with its distinctive Montana Peak we recognize today as the "ranger hat." This peak had been formed into the trooper's stetson by veterans of the 1898 Spanish–American War to better shed tropical rain. Muir and his Sierra Club continued to lobby the government and influential people for the creation of a