Center for Biological Diversity

For Immediate Release, August 29, 2023


Greta Anderson, Western Watersheds Project, (520) 623-1878,
Michael Robinson, Center for Biological Diversity, (575) 313-7017,
Mary Katherine Ray, Rio Grande Chapter Sierra Club, (575) 537-1095,
Chris Smith, WildEarth Guardians, (505) 395-6177,

Mexican Gray Wolves Receive More Protections From Government Killings

TUCSON, Ariz.— Wildlife Services, a program of the U.S. Department of Agriculture, has released a new set of standards it will use to determine the cause of livestock deaths in Arizona and New Mexico. Conservation groups have sought such changes to ensure Mexican gray wolves aren’t unfairly blamed for livestock deaths.

The new standards require evidence, such as subcutaneous hemorrhaging, that the livestock animal was alive during the wolf encounter, and additional indicators of wolf involvement.

“Our goal has been to make sure that Mexican gray wolves aren’t being unfairly blamed for livestock depredation,” said Greta Anderson, deputy director of Western Watersheds Project. “The over-reported incidence of wolf involvement in cattle deaths in the Southwest has had negative impacts on the wolf recovery program, including the killing and capture of wild wolves. We’re hoping the new standards help prevent that from happening again.”

Today’s action follows an exposé of Wildlife Services’ unscientific and unsupportable reports, in which a former state director of the agency called out what he saw as corruption in the livestock deaths reporting program. A Western Watersheds Project review of five years of predation reports highlighted poor data collection, illogical conclusions, and an unjustifiably high rate of blaming wolves for the deaths of livestock on public lands.

“It’s appalling that the U.S. Department of Agriculture blames endangered Mexican gray wolves for killing cows that died of something completely different,” said Michael Robinson, a senior conservation advocate at the Center for Biological Diversity. “I’m glad they’re tightening standards for determining the causes of cattle mortality, but the government should go further and require that ranchers properly dispose of dead cattle to protect both wolves and livestock.”

“We’re happy to see these standards tighten, of course,” said Chris Smith, southwest wildlife advocate for WildEarth Guardians. “But extremely endangered species were wrongly killed before this improvement. And history suggests corruption and a deep-seeded antagonism to wolves within the U.S. Department of Agriculture.”

“Our small but beautiful wolf subspecies, the Mexican wolf, bears the burden of so much undeserved hatred,” said Mary Katherine Ray, wildlife chair for the Rio Grande Chapter of the Sierra Club. “Wildlife Services has a responsibility to not only accurately determine the cause of livestock death but also to help dispel the myths surrounding wolves and promote strategies that avoid conflicts.”

The new standards for the Southwest are the same standards that Wildlife Services and other state agencies, including Montana, Wisconsin, Oregon and Idaho, use to confirm gray wolf involvement in livestock deaths.

The Center for Biological Diversity is a national, nonprofit conservation organization with more than 1.7 million members and online activists dedicated to the protection of endangered species and wild places.

center locations