When a species no longer lives in a particular part of its range, it is considered “locally extinct,” or extirpated. An example of that is the wolf in most parts of the United States, Mexico, and Europe. The wolf is not extinct but has been extirpated from many areas where it once lived. Yellowstone National Park was one such area. In the 1990s, wildlife biologists brought wolves from Canada to live in Yellowstone. Today, about 300 wolves make Yellowstone their home. (Holly Kuchera/ Shutterstock) Read More