The gray wolf or 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 gray 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.

Gray 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. Gray wolves are typically apex predators throughout their range, with only humans and tigers posing significant threats to them.

Although wolf packs do cooperate strategically in bringing down prey, they do not do so as frequently or as effectively as lionesses do; unlike lions, wolves rarely remain with their pack for more than two years, thus they have less time to learn how to hunt cooperatively. Contrary to lion prides, food acquisition per wolf decreases with pack size.

Wolves are notoriously difficult to hunt due to their elusiveness, their sharp senses, their high endurance in the chase and ability to quickly incapacitate and kill hunting dogs. When hunting wolves with dogs, usually combinations of sighthounds, bloodhounds and fox terriers are used. The sighthounds chase and immobilise wolves until the arrival of the heavier dogs which do most of the fighting. Still hunting of wolves (alternately walking quietly and waiting concealed in the pursuit of game) is primarily practised in areas where the terrain is too rough for hunting with dogs, though wolves are almost as hard to hunt with this method as cougars are. Because of their sharp hearing, wolves are almost impossible to stalk, even when asleep.