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
History of the Yosemite area Muir died he expressed the hope that "some compensating good must follow" from the Raker Act. The fight over the dam strengthened the conservation movement by popularizing it nationally. The administration of Yosemite National Park was transferred to the newly formed National Park Service in 1916, when W. B. Lewis was appointed as the park's superintendent. Parsons Memorial Lodge and Tioga Pass Road, along with campgrounds at Tenaya and Merced lakes, were completed the same year; six hundred automobiles entered the east side of the park using Tioga Road that summer. The "All-Weather Highway" (now State Route 140) opened in