Hunting virtually eliminated gray wolves from the western U.S.
by the 1930s. The Endangered Species Act offered Canis lupus federal
protection in 1973, and wolves were reintroduced to Yellowstone National
Park more than 20 years later.
Northern Rocky Mountains gray wolf placed on endangered species list.
Gray wolf listed throughout range in the Lower 48 states.
Wolves from Canada are reintroduced into Yellowstone National Park and central Idaho.
Reintroduced wolves in the Northern Rockies exceeded population goals for 10 consecutive years.
The U.S. tries to delist the gray wolf at least three times, but is defeated in court.
Wolves are delisted in Idaho and Montana, where wolf hunting begins; 260 wolves are killed.
Wolf protection is reinstated by a district court.
Federal protections are officially removed in Idaho and Montana, but remain in place in Wyoming.
Wyoming wolf population
is delisted and managed by the state. Wolves in the western Great Lakes
states are removed from the endangered species list.
U.S. officials propose to delist gray wolves in the Lower 48 states, except for a small population in the Southwest.
Sources: U.S. Fish & Wildlife Service, Defenders of Wildlife.
Credits: Graphic by Lorena Iniguez Elebee. Graphics reporting by Julie Sheer. Programming by Anthony Pesce.