Endangered Species Act (ESA): In 1975, The U.S. Fish and Wildlife Service listed the grizzly bear as a threatened species in the Lower 48 states, under the Endangered Species Act. In Alaska, where there are estimated to be over 30,000 grizzly bears, they are classified as a game animal with regionally established regulations. The Yellowstone population of grizzly bears was declared recovered and removed from the threatened species list in April of 2007.
Brown bears are listed in Appendices I and II, depending on the population. More plentiful populations are listed in Appendix II, while certain low populations are listed in Appendix I.