Wolves were once common throughout all of North America but were killed in most areas of the United States by the mid 1930s. Today their range has been reduced to Canada and the following portions of the United States: Alaska, Idaho, Michigan, Minnesota, Montana, Wisconsin and Wyoming. Mexican wolves are found in New Mexico and Arizona. Thanks to the reintroduction of wolves in 1995, Yellowstone National Park is one of the most favored places to see and hear wolves in the native habitat. The grey wolf (Canis lupus), often known simply as the wolf, is the largest wild member of the Canidae family. Though once abundant over much of Eurasia and North America, the grey wolf inhabits a reduced portion of its former range due to widespread destruction of its territory, human encroachment, and the resulting human-wolf encounters that sparked broad extirpation. Even so, the grey wolf is regarded as being of least concern for extinction by the International Union for Conservation of Nature, when the entire grey wolf population is considered as a whole. Today, wolves are protected in some areas, hunted for sport in others, or may be subject to extermination as perceived threats to livestock and pets. Grey wolves are social predators that live in nuclear families consisting of a mated pair which monopolises food and breeding rights, followed by their biological offspring and, occasionally, adopted subordinates. They primarily feed on ungulates, which they hunt by wearing them down in short chases. Grey wolves are typically apex predators throughout their range, with only humans and tigers posing significant threats to them. DNA sequencing and genetic drift studies reaffirm that the grey wolf shares a common ancestry with the domestic dog. A number of other grey wolf subspecies have been identified, though the actual number of subspecies is still open to discussion. In areas where human cultures and wolves are sympatric, wolves frequently feature in the folklore and mythology of those cultures, both positively and negatively. Defenders and many other conservation organizations have been working tirelessly on wolf conservation in North America from aerial hunting in Alaska to restoration efforts in the lower 48 States. Wolves are an integral part of an ecosystem as a top tier predator and Defenders will continue to make sure this iconic symbol of America always has a place here.