Wild pigs found to have blue meat and fat show signs of having eaten rat poison, California wildlife officials warned. In March, a wildlife trapper reported discovering the dyed tissue in wild pigs caught in Monterey County, the state Department of Fish and Wildlife said in a July 30 news release.

Wildlife officials are worried wild pigs have become exposed to rodenticide, contaminating the animals and turning their meat and fat blue.

Unexpected exposure to rodenticide is turning California’s wild pigs blue, state authorities say. “I’m not talking about a little blue,” Dan Burton, owner of a wildlife control company in Salinas, California, told The Los Angeles Times. “I’m talking about neon blue, blueberry blue.”