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 Transportation Company Office Yosemite Transportation Company Office The Yosemite Transportation Company Office, also known as the Wells Fargo Office, was built in the Yosemite Valley in 1910 to house facilities of motor stage and horse stage services between the nearest rail terminal at El Portal and Yosemite National Park. The rustic log structure also provided telegraph and express services. The 1-1/2 story log structure measures by , with a prominent front porch, accented by a decorative log truss. The building is an example of the National Park Service rustic style as it was applied at Yosemite, with strips of cedar bark applied in