05/19/2026
A case of unintended consequences..and it can happen anywhere
US boars are contaminated because of rodenticides — and they turned blue.
Hunters in Northern California were stunned when they dressed out wild pigs and found glowing neon-blue fat—an unmistakable sign of poisoning by a common rodenticide.
The pigs, taken in Monterey County, had eaten bait containing diphacinone, an anticoagulant rodent killer that manufacturers dye bright blue for easy identification. Although diphacinone is considered less persistent than newer “super-toxic” rodenticides, it still accumulates in fat and remains lethal to anything that eats the poisoned animal.
While the meat itself looks normal, the vivid blue lard has raised immediate food-safety alarms: contaminated pigs are unsafe for human or pet consumption, yet the discoloration is only visible after the animal is field-dressed.
Wildlife officials say the incident exposes a much larger problem. Mountain lions, bobcats, foxes, coyotes, eagles, and even endangered northern spotted owls have all died after feeding on rodents killed by the same class of poisons.
In response, California has sharply restricted many anticoagulant rodenticides and is pushing integrated pest management—using snap traps, owl boxes, habitat modification, and non-toxic repellents instead of broadcast poison.
Authorities are now asking hunters and hikers to immediately report any unusually colored fat or organs in wildlife. The glowing blue pigs are a vivid, visible reminder that chemicals spread far beyond their intended target and can silently move up the food chain
