As Yellowstone National Park in Wyoming opens for the busy summer season, wildlife advocates are leading a call for a boycott of the conservative ranching state over laws that give people wide leeway to kill gray wolves with little oversight.

The social media accounts of Wyoming’s tourism agency are being flooded with comments urging people to steer clear of the Cowboy State amid accusations that a man struck a wolf with a snowmobile, taped its mouth shut and showed off the injured animal at a local bar before killing it.

While critics contend that Wyoming has enabled such animal cruelty , a leader of the state’s stock growers association said it’s an isolated incident and unrelated to the state’s wolf management laws. The laws that have been in place for more than a decade are designed to prevent the predators from proliferating out of the mountainous Yellowstone region and into other areas where ranchers run cattle and sheep.

“This was an abusive action. None of us condone it. It never should never have been done,” said Jim Magagna, executive vice president of the Wyoming Stock Growers Association and a local rancher who has lost sheep to wolves. “It’s gotten a lot of media attention but it’s not exemplary of how we manage wolves to deal with livestock issues or anything.”

Wolves are federally protected as an endangered or threatened species in most of the US but not the Northern Rockies. Wyoming, Idaho and Montana allow wolves to be hunted and trapped, after their numbers rebounded following their reintroduction to Yellowstone and central Idaho almost 30 years ago. Before their reintroduction, wolves had been annihilated in the lower 48 states through government-sponsored poisoning, trapping and bounty hunting into the mid-1900s.

Today, Wyoming has the least restrictive policies for killing wolves. There are limits on hunting and trapping in the northwestern corner of the state and killing them is prohibited in Yellowstone and neighbouring Grand Teton National Park, where they are a major attraction for millions of tourists. But outside the Yellowstone region, in the 85 per cent of the state known as the “predator zone” they can be freely killed.

The wolf allegedly was run down, shown off and killed within the predator zone.

Widely circulating photos show the man posing with the wolf with its mouth bound. Video clips show the same animal lying on a floor, alive but barely moving.

The Sublette County Sheriff’s Office said it has been investigating the anonymous reports of the man’s actions but has struggled to get witnesses to come forward.

“We’ve had the tip line open for two weeks hoping for witnesses or something helpful,” sheriff’s spokesperson Sergeant Travis Bingham said. “I know there’s some hesitation for people to come forward.”

The only punishment for the man so far is having to pay a US$250 ($420) ticket for illegal possession of wildlife.

The suspect has not commented publicly and did not answer calls to his business. Calls to the bar went unanswered.

Wyoming’s rules, including the predator zone, have withstood multiple court challenges that have put wolves on and off the endangered species list since they were first delisted in 2008. Wolves haven’t been on the list in the region since a 2017 court order and their current Wyoming population of more than 300 is similar to their number in 2010.

Though state law doesn’t specify how wolves in the predator zone can be killed and doesn’t specifically prohibit running them over, the Humane Society and others argue the state’s animal cruelty law applies in this case.