With an area of about 362,000 km2 (139,769 sq mi), the Chihuahuan Desert is the third largest desert of the Western Hemisphere and the second largest in North America. The Chihuahuan Desert may be the most biologically diverse desert in the world as measured by species richness or endemism. The region has been badly degraded, mainly due to grazing. Many native grasses and other species have become dominated by woody native plants, including creosote bush and mesquite, due to overgrazing and other urbanization. The Mexican Wolf once abundant, was nearly extinct and remains on the endangered species list.