Bald eagles, bears and foxes are dying from rat poisoning. Here's how you can protect them

Rat poison continues to sicken and kill California’s wildlife at alarming rates, despite legislation designed to prevent the use of such chemicals.

That’s according to a recently published report from the California Department of Fish and Wildlife. The 2024 survey found anticoagulant rodenticides — a fancy name for one of the most toxic types of rat poison — in the bodies of 95% of mountain lions and 83% of bald eagles tested, as well as dozens of other species, including foxes, bobcats, owls, hawks, black bears and endangered California condors.

Even river otters have been poisoned, a sign these chemicals may be seeping into waterways.

“We’re still seeing too many animals being victims of rat poison,” said Lisa Owens-Viani, director of Berkeley-based nonprofit  Raptors Are the Solution.

Keep up with LAist.

If you're enjoying this article, you'll love our daily newsletter, The LA Report. Each weekday, catch up on the 5 most pressing stories to start your morning in 3 minutes or less.

Subscribe

How we got here

Rats are a big problem in Southern California. And people resort to rat poison to solve the problem, placing it in baits and traps. The problem with that is wild animals also fall for the lures. Or, hungry predators feast on the poison-filled rats.

Anticoagulants were one of the final blows to L.A.’s most famous mountain lion, P-22. He was sickened by such rodenticides likely after eating prey that had ingested them. Disoriented and ill, the beloved puma then wandered into the road and was struck by a car just south of his home in Griffith Park. P-22 later died from his injuries.

Famed mountain lion P-22 suffered from mange linked to rat poisons and died after being struck by a vehicle near Griffith Park.

(

Courtesy Center for Biological Diversity

)

Why legislation hasn’t solved it

For more than two decades, California has passed laws to limit the use of certain pesticides. Starting in 2020, the state passed a series of legislation banning some of the most toxic types:

• The Ecosystem Protection Act of 2020 (AB1788) placed a moratorium on all second-generation anticoagulant rodenticides, which are stronger and last in animal tissue longer than earlier types. 
• The California Ecosystem Protection Act of 2023 and the Poison-Free Wildlife Act of 2024 expanded that moratorium to first generation anticoagulant rodenticides, including chlorophacinone and warfarin, which are older versions of rat poison that take longer to build up in the body.

However, there are exemptions in those laws, including the use of such rodenticides in agriculture, certain public health settings, such as hospitals, and other sensitive settings.

Owens-Viani thinks that’s a big reason why the number of poisonings continue to be high.

“We're not seeing the decreasing trend that we had hoped for,” she said.

A bobcat sickened by rodenticides is cared for at Simi Valley-based wildlife rescue Wildlife Care of Southern California.

(

Anna Reams

/

Wildlife Care of Southern California

)

Jonathan Evans, the Environmental Health Legal Director for the Center for Biological Diversity, noted that some of the state’s best protections against rat infestations — great-horned owls, hawks and other raptors — are also dying at some of the most alarming rates from rat poisons.

“All of these animals are some of our best rodent control mechanisms. Like these animals feed on rats and mice and can do it very efficiently,” Evans said. “We really should be looking at figuring out why we still have high levels [of poisonings] and what we can do to close the loopholes and make rodent control more ecologically effective."

Why the problem could get worse

There are also gaps in the data, meaning the real numbers of poisonings are likely far higher, Evans said.

As part of its methods to calculate poisoning rates, the Department of Fish and Wildlife has to analyze dead carcasses that often have to be submitted to them by the public, he said.

“Most of these animals that die of rodenticide poisonings are going to die out in the woods where nobody finds them,” Evans said.

A mountain lion photographed with a motion sensor camera in the Verdugo Mountains overlooking the city lights of Los Angeles.

(

National Park Service

)

And now, the state’s Department of Pesticide Regulation is considering rolling back many of these protections by allowing more than 100,000 new locations, including grocery stores, restaurants and even parks, to use most toxic rat poisons.

Six lawmakers who helped craft the 2024 moratorium on these chemicals sent a letter to the agency earlier this year asking them to rescind the proposal.

Here’s how you can help protect wildlife 

• For one, don’t use rodenticides in your yard. Death by anticoagulant rodenticide poisoning is painful and slow — these poisons cause species to slowly bleed out from the inside, with signs in hawks and other raptors often being blood seeping from their beaks and eyes. Larger mammals, such as mountain lions and coyotes, can also develop mange as a result of the poisons weakening their immune systems.
  
• Securing your trash, pet food and even bird feeders are other important ways to keep rats (and unwanted wildlife) from your home. Evans noted there are also new technologies, such as fertility control, electric traps and improved methods of fortifying buildings from rats. You can find additional resources for wildlife-safe rodent control from the Center for Biological Diversity and Raptors are the Solution at SafeRodentControl.org or here.
  
• And if you do come across wild animal you suspect has been poisoned, report it to your local wildlife rescue agency or animal control office, as well as the California Department of Fish and Wildlife at WHLab@wildlife.ca.gov or (916) 358-2790.