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 Firefall the Yosemite Park and Curry Company under the direction of the Curry family. YPCC continued to be the concessionaire of Yosemite National Park until 1993 (Although the YPCC has been owned by various corporations in recent decades, the name remained unchanged). During World War II the Firefall was discontinued. Some people in both the National Park Service and the Yosemite Park and Curry Company hoped that it would not be continued after the war. The NPS considered it an unnatural event in a natural area, and the task of presenting the Firefall each night was burdensome to YPCC. Employees drove