VALE, Ore. — As wolves continue to disperse throughout the state law enforcement officials and ranchers are learning how to determine whether livestock was killed by wolves or another predator.
Todd Nash, a Wallowa County rancher who attended the meeting, said the instructors, Canadian conservation officers James Barber and Jesse Jones, talked about looking at the totality of information at hand when investigating livestock that appears to be killed by a predator.
During an investigation, the instructors noted the type and age of the livestock and whether the rancher had previous problems with any particular predator.
Then, Nash said, they moved on to obvious things such as ruling out bears in the winter and looking for tracks, bite marks and attack sites.
Various predators kill differently, the instructors said. When bears attack, they maul, using their paws, but not always their claws. He said bears get on the back of their prey and often attack the withers, the ridge between an animal’s shoulder blades.
Differentiating between coyotes and wolves is largely determined by the spacing of their teeth. Also, wolves are bigger and stronger and can take on larger prey. Both canine predators use their teeth, but coyotes are multiple biters, leaving more bite marks than wolves.
Cougars are more strategic and typically kill their prey by clamping down with one bite.
Oregon ranchers whose livestock and working dogs have been proven killed by a wolf can apply for compensation under a program administered by the Oregon Department of Agriculture.
Jerome Rosa, the Oregon Cattlemen’s Association executive director, said his organization was a supporter of the training, which was sponsored by the Malheur County Sheriff’s Office.
“With the Oregon wolf population increasing 30 percent per year and limited qualified personnel to confirm depredations, this program is another tool in the toolbox to manage escalating conflicts between predators, livestock and humans,” Rosa said.
Following a string of investigations into dead cattle presumed killed by wolves, Travis Johnson, Malheur County’s under sheriff, said there was an interest in getting additional training in necropsies.
“Part of the reason we want to bring this in is so we will all be better educated,” Johnson said.
The deputies have had a couple of classes, Johnson said, and have worked closely with Wallowa County Sheriff Steve Rogers and Chief Deputy Fred Steen, who are well familiar with investigating whether livestock was killed by wolves.
Wolf attacks on livestock started in 2009 when lambs and a calf were killed outside Baker City. Steen said shortly after wolves began killing cattle in Wallowa County in the spring of 2010 he attended training in Enterprise led by Rick Williams, a USDA Wildlife Services agent from Idaho, and a workshop hosted by Oregon Department of Fish and Wildlife in La Grande.
But the bulk of his expertise in animal necropsies, he said, was in the field investigating dead livestock with Marlyn Riggs, who was Wallowa County’s Wildlife Services field agent until 2014.
Steen said he attended the workshop in Malheur County “to see how these Canadian conservation officers work through their process.”
Like the Wallowa County sheriff’s office, Johnson said when his deputies investigate a potential wolf-kill they treat the area like a crime scene and contact the Oregon Department of Fish and Wildlife. A veterinarian who is on Malheur County’s wolf compensation committee has assisted with necropsies and trained the deputies.
An investigation of an animal presumed killed by a predator attempts to determine if the animal was killed or if it died of other causes and was eaten by wolves afterward.
“We want to try and be able to differentiate between different kills,” Johnson said. “With each predator the kill characteristics are different. All are very distinct and some distinctions are very nuanced.”
The state Department of Fish and Wildlife has hosted a few workshops with Wildlife Services, Roblyn Brown, Oregon’s wolf coordinator, said.
“These one-day trainings have focused on non-lethal and lethal measures that can be taken when wolves are in an area, what to do if you believe a wolf or other predator has attacked livestock, signs of wolf and other predator attacks and our evidence-based investigation process and current information about wolves in Oregon,” Brown said.
Brown said working with ranchers in the field has been useful.
“We have found the actual investigation is a good time to work with producers to learn about investigating different predator attack signatures,” Brown said.