We, the U.S. Fish and Wildlife Service, are initiating 5-year reviews for 53 species under the Endangered Species Act of 1973, as amended (Act). We conduct these reviews to ensure that our classification of each species on the Lists of Endangered and Threatened Wildlife and Plants as threatened or endangered is accurate. A 5-year review assesses the best scientific and commercial data available at the time of the review. We are requesting any information that has become available since our original listing of each of these species. Based on review results, we will determine whether we should change the listing status of any of these species. In this notice, we also announce 5-year reviews that were completed for 32 species in California and Nevada between April 1, 2010, and March 16, 2011.