For centuries, the Gray Wolf’s (Canis Lupus) relationship with humankind has been complicated. Gray Wolves can be found on three continents and as of 2005, 37 subspecies are recognized. North America is home to four subspecies—Northwestern Wolf, Great Plains Wolf, Arctic Wolf, and the Mexican Wolf. Once common throughout all of North America, Gray Wolves were hunted to extinction in much of their range by the 1930s. Thanks to reintroduction efforts, they have started to recover.