Connectivity and Conservation: Grizzly Bears in the Lower 48

August 21, 2019

Once a wide-ranging species in the western United States, grizzly bears today inhabit only a small fraction of their historical range in the Lower 48. The greater Yellowstone ecosystem population—the second-largest grizzly bear population in the contiguous United States—has increased markedly in size and range extent since the grizzly bear was listed as threatened under the Endangered Species Act in 1975. Yet this population still faces various threats, including its isolation from other grizzly bear populations. These interactive maps discuss the issue of grizzly bear conservation and present potential corridors that could help reconnect the Yellowstone grizzlies with populations to the north.