Gray Wolf
Canis lupus
The wolf is the largest member of the canine family. Gray wolves range in color from grizzled gray or black to all-white. As the ancestor of the domestic dog, the gray wolf resembles German shepherds or malamutes. Wolves are making a comeback in the Great Lakes, Northern Rockies and Southwestern United States.
Height 26-32
inches at the shoulder
Length 4.5-6.5
feet from nose to tip of tail
Weight 55-130
lbs; Males are typically heavier and taller than the females
Lifespan 7-8
years in the wild, but some have lived 10 years or more
Diet
Staples Ungulates
(large hoofed mammals) like elk, deer, moose and caribou.
Also known to eat beaver, rabbits and other
small prey. Wolves are also scavengers and often eat animals that have died due
to other causes like starvation and disease.
Population
There are an estimated 7,000 to 11,200 wolves in Alaska and more than 5,000 in the lower 48 states. Around the world there are an estimated 200,000 in 57 countries, compared to up to 2 million in earlier times.
Range
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.
Behavior
Wolves live, travel and hunt in packs of 4-7 animals on average. Packs include the mother and father wolves, called the alphas, their pups and several other subordinate or young animals. The alpha female and male are the pack leaders that track and hunt prey, choose den sites and establish the pack's territory. Wolves develop close relationships and strong social bonds. They often demonstrate deep affection for their family and may even sacrifice themselves to protect the family unit.
Wolves have a complex communication system ranging from barks and whines to growls and howls. While they don’t howl at the moon, they do howl more when it’s lighter at night, which occurs more often when the moon is full.
Reproduction
Mating Season
January or February
Gestation 63
days
Litter size 4-7
pups
Pups are born blind and defenseless. The pack cares for the
pups until they mature at about 10 months of age.
Threats
The most common cause of death for wolves is conflict with people over livestock losses. While wolf predation on livestock is fairly uncommon, wolves that do prey on them are often killed to protect the livestock. Defenders is working with livestock owners to develop non-lethal methods to reduce the chances of a wolf attacking livestock. These methods include fencing livestock, lighting, alarm systems and removing dead or dying livestock that may attract carnivores like wolves.
Another serious threat is human encroachment into wolf territory, which leads to habitat loss for wolves and their prey species.
Overall, the greatest threat to wolves is people’s fear and misunderstanding about the species. Many fairy tales and myths tend to misrepresent wolves as villainous, dangerous creatures.
Bush administration rushes to strip protections from Northern Rockies wolves
January 14, 2009 - In a last-ditch effort by the Bush administration to undermine environmental protections, the U.S. Fish and Wildlife Service announced that the Northern Rockies gray wolf will be taken off the Endangered Species List.
Stay Up to Date:
My Yellowstone Wolves
Legal Status/Protection
Under the Endangered Species Act* (ESA), gray wolves are listed as endangered in the lower 48 states, except Minnesota, where they are listed as threatened. Wolves in Alaska are not listed under the ESA.
Endangered means a species is considered in danger of extinction throughout all or a significant portion of its range, and threatened means a species may become endangered in the foreseeable future.
Portions of the Northern Rockies (Wyoming, central Idaho, and southern Montana) and the Southwest are designated as non-essential experimental populations, which isolate geographically-described groups from other existing populations and offer broader management regulations.
Read more about Wolves and the Endangered Species Act
* The Endangered Species Act requires the US federal government to identify species threatened with extinction, identify habitat they need to survive, and help protect both. In doing so, the Act works to ensure the basic health of our natural ecosystems and protect the legacy of conservation we leave to our children and grandchildren.
How You Can Help
- Help gray wolves and other wildlife by adopting a wolf or making a wolf-saving gift today at our Wildlife Adoption and Gift Center!
- Take Action for Wildlife at our Wildlife Action Center.
For additional information
Wolves in Yellowstone (CNN Planet in Peril Video)
