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Wolves of the World

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Depredation on Livestock and Pets

Bill Paul, U.S. Department of Agriculture - Wildlife Services, Ed Bangs, Wolf Recovery Coordinator, U.S. Fish and Wildlife Services, Carter Niemeyer, U.S. Department of Agriculture - Wildlife Services, Elizabeth Harper, Fisheries and Wildlife Department, University of MN

Wherever they coexist, wolves may prey on domestic animals. However, wolves normally prefer natural prey such as deer and elk. When wolves kill domestic animals it is called depredation. Wolves and domestic animals have interacted in North America since the arrival of Europeans with dogs and cattle. Yet efforts to understand and manage wolf and domestic animal interactions without whole-scale eradication did not begin in earnest until the mid 1970s.

Minnesota
Wolves became completely protected in Minnesota in 1974 under the federal Endangered Species Act (ESA). The responsibility to deal with wolf-caused livestock and pet losses then fell to the federal government. In 1975, the U.S. Fish and Wildlife Service (USFWS) began trapping at farms experiencing verified * wolf depredation. Wolves that were captured from 1975 to 1978 were translocated (moved) because they were listed as endangered under the ESA, and could not be killed. In April 1978, wolves in Minnesota were downlisted from endangered to threatened. This new classification allowed the USFWS (and since 1986, the U.S. Department of Agriculture (USDA)) to destroy wolves that kill livestock.

Since their protection, wolf numbers in Minnesota have steadily increased. The Minnesota Department of Natural Resources estimated the wolf population in Minnesota at approximately 3,020 (with a variation of 700+/-individuals) animals during the winter of 2003-04, an increase in population of 23% since 1998.

As the wolf population has increased, their range has ceased to expand southward and westward. The gray wolf's range in Minnesota is now approximately 29,197 square miles. Even with the population increasing, verified wolf depredation claims are somewhat stable with a peak from 1997-2002 and a slow decrease in 2003 and 2004.

Even during times of high numbers of depredations, only a small portion of Minnesota farmers are affected. In 2004, a total of 52 farms, approximately 1% of the farms in Minnesota's wolf range, had verified incidents of depredation - this number is down from 87 farms in 1999. These livestock-raisers are eligible for compensation of up to $750 per animal by the Minnesota Department of Agriculture. Producers are not compensated for losses to other predators, such as bear or coyote. Compensation payments paid to Minnesota farmers in 2003 added up to $53,852.85, the lowest since 1997.

The number of wolf depredations may actually be higher than reported, as many claims of wolf depredation, such as missing calves, can not be verified. Even though this is true, the view of wolves as livestock predators has sometimes been exaggerated, as depredation caused by coyotes, dogs, and bears is often misidentified by farmers as wolf depredation.

Most verified losses occur from May through October when livestock are released to graze in open and wooded pastures. Some animal husbandry practices, such as calving in forested or brushy pastures and disposing of livestock carcasses in or near pastures, have been believed to contribute to wolf depredation in Minnesota. However, new research has indicated that these factors do not contribute to wolf depredation.

Cattle, sheep, and turkeys are the domestic animals most often taken by wolves, however, domestic dog depredation does occur. Wolf depredation on dogs has become more common in recent years as wolves have colonized areas with higher human densities. Dog owners in wolf territories can reduce the opportunity for wolf depredation by keeping pets inside or in an enclosed kennel when wolves are know to be in the area.

Verified wolf depredation on domestic animals in Wisconsin and Michigan (dogs are not compensated in MI) are compensated at 100% of the estimated value of the livestock.

Montana, Idaho, and Wyoming
In the western U.S., gray wolves began to naturally recolonize northwestern Montana in the early 1980s. The first den was discovered in 1986 in Glacier National Park. Wolf numbers increased in Montana to a peak of around 90 animals in 1996, but a severe winter in 1996/1997 reduced the wolf population to 60-70 individuals. Nearly all the packs in Montana have livestock, primarily cattle, in their territory and routinely encounter domestic animals. Since 1987, when the first depredation on livestock occurred, the USDA Wildlife Services and the USFWS have cooperatively documented and resolved conflicts between wolves and livestock. In accordance with the Service's wolf control plan, problem wolves are usually moved after the first offense, but if they depredate again they are killed. Since 1987, in northwestern Montana wolves have been moved 32 times and 67 wolves have been killed because of conflicts with livestock. Wolf control has affected less than 6% of the wolf population in northwestern Montana annually. Agencies have also tried aversive conditioning, radio-collaring and releasing wolves on site, and placing problem wolves in captivity. Translocating problem wolves and immediately releasing them has been largely unsuccessful at preventing further livestock losses and at keeping wolves alive. It is likely that the Service will increasingly kill wolves that attack livestock rather than move them.

Between 1987-2003, wolves in northwestern Montana killed an average of 6 cattle, 5 sheep, and less than 1 dog annually, a relatively small loss to the livestock industry. Wolf damage is often significant to individual ranchers, however, and is always emotional. Fortunately, the Defenders of Wildlife initiated a private livestock compensation program that has reimbursed all producers who had confirmed wolf-caused losses. Their program paid out $300,000 to livestock producers in Montana, Idaho, and Wyoming from 1987-2003. Producers in Montana are not compensated for losses caused by other predators.

Wolves were reintroduced from Canada to central Idaho and Yellowstone National Park in January 1995 and 1996. Wolves have adapted to their new home better than expected and by late 1999 there were around 120-150 wolves in each reintroduction area and there are now approximately 700. Before wolves were reintroduced, the Service predicted that 100 wolvers would kill about 10 - 20 cattle and 60 - 70 sheep annually in each of the two areas. Verified losses have actually been much lower, averaging 4 cattle, 18 sheep, and 1 dog in central Idaho and 7 cattle, 25 sheep and 1 dog in the area around Yellowstone. In response to these depredations, as of 2004, 38 wolves have been moved and 45 have been killed in Idaho. In and around Yellowstone, 42 wolves have been moved and 95 have been killed. Wolves observed attacking livestock can be legally shot by livestock producers under the experimental - nonessential rule.

Wolf restoration efforts in the northern Rocky Mountains has been successful far beyond predictions and it is expected that wolf populations are nearly recovered (10 breeding pairs in each of the three recovery areas for three successive years) in the next few years.. As a result, wolves are part of the western ecosystem and are being enjoyed by the public. An estimated 50,000 visitors to Yellowstone National Park alone have had the opportunity to hear and observe wolves. With success comes the responsibility to protect local residents from an unreasonable level of livestock losses caused by wolves. The Defenders program certainly makes a difference but depredation control is still necessary. Wildlife managers must occasionally kill wolves that depredate on livestock so that this behavior does not become common in the general wolf population. The bitter debate over wolf restoration is largely over . Wolves have returned to the West and they are here to stay. In the future the debate will increasingly have to focus on the use of lethal methods to control wolf-caused problems, unless some new non-lethal method is found. So far, millions of dollars have been spent seeking such a method for coyote depredation control, but to little avail.

*A verified complaint is one in which USDA officials determine that wolves have killed or maimed one or more domestic animals as evidenced by (1) observing wounded animals or remains of animals killed and (2) finding evidence of wolf involvement.

Literature cited

1. Fritts, S.H., W.J. Paul, L.D. Mech, and D.P. Scott. 1992. Trends and Management of Wolf-Livestock Conflicts in Minnesota. U.S. Fish and Wildlife Service, Resources Publication 181. 27pp.

2. Paul, W.J. 2000. Annual update of Minnesota wolf depredation statistics. U.S. Dept. of Agriculture, Grand Rapids, Minnesota. Unpublished report.

3. Mech, L.D.., E.K. Harper, T.J. Meier, and W.J. Paul. 2000
Assessing factors that may predispose Minnesota farms to wolf depredations on cattle.Wildl. Soc. Bull. (in press).

4. Bangs, E.E., J.A. Fontaine, M.D. Jimenez, B. Cox, T.J. Meier, and D. Boyd.
Gray wolf restoration in the northwestern United State. Proc. of Beyond 2000: Realities of Global Wolf Restoration. 23-26 February 2000, Duluth, Minnesota.

5. Bangs, E.E., S.H. Fritts, D.R. Harms, J.A. Fontaine, M.D.Jimeniz, W.G. Brewster, and C.C. Niemeyer Control of Endangered Gray Wolves in Montana. Pages 127-134 in L.N. Carbyn, S.H. Fritts and D.R. Seip Eds. Ecology and Conservation of Wolves in a Changing World. Canadian Circumpolar Inst. Occa. Publ. No. 25, Univ. of Alberta, Edmonton, Canada.

6. Bangs, E.E., and S.H. Fritts 1996. Reintroducing the Gray Wolf to Central Idaho and Yellowstone National Park. Wildl. Soc. Bull. 24(3):402-413.

7. Bangs, E.E., S.H. Fritts, J.A. Fontaine, D.W. Smith, K.M. Murphy, C.M. Mack, and C.C. Niemeyer. 1998 Status of gray wolf restoration in Montana, Idaho, and Wyoming. Wildl. Soc. Bull. 26:785-798.

8. Paul, W.J. 2003. Annual update of Minnesota wolf depredation statistics. U.S. Dept. of Agriculture, Grand Rapids, Minnesota. Unpublished report.

Updated December 2004