As of 2018, the global grey wolf population is estimated to be 200,000–250,000. Once abundant over much of North America and Eurasia, the grey wolf inhabits a smaller portion of its former range because of widespread human encroachment and destruction of its habitat, and the resulting human-wolf encounters that sparked broad extirpation. Wolf reintroduction programs have been instituted where there is suitable wilderness. Considered as a whole, however, the grey wolf is regarded as being of least concern for extinction according to the International Union for the Conservation of Nature and Natural Resources. Today, wolves are protected in some areas, hunted for sport in others, or may be subject to extermination as perceived threats to people, livestock, and pets.