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 Museum impressiveness here in a building would have meant entering into a competition with the cliffs." Maier went on to design many structures that are considered exemplary rustic style. In 1933, Maier was hired by the National Park Service as the regional director for the Civilian Conservation Corps (CCC) work in state parks. In this capacity, Maier helped develop guidebooks to assist state park designers in using rustic design principles. These books were widely distributed and influenced design of park structures nationwide at a time when hundreds of new parks were developed with CCC labor. Yosemite Museum The Yosemite Museum is