Results on the Coyote from Strawberry

We received lab results from the coyote that appeared to have died from anticoagulant rodenticide poisoning.  This coyote was found in weakened condition in Strawberry (El Dorado County) in early June and brought into Tahoe Wildlife Care.

It did not recover and was euthanized.

The lab findings were not surprising:  very high liver concentrations of the anticoagulant most commonly found in non-target wildlife: brodifacoum.  Another anticoagulant rodenticide was found in lower concentrations:  bromadiolone.

Anticoagulant exposure causes internal bleeding, including the subdermal bleeding seen here.

Rodent poisons containing brodifacoum can be purchased at grocery stores and hardware stores.  The U.S. Environmental Protection Agency has proposed limits on their availability but so far those limits are not in effect.

DFG urges residents to protect wildlife in their area by limiting use of products containing brodifacoum, bromadiolone, and difethialone.  These materials are the active ingredients in some rodent baits and have been found in a high percentage of our predatory and scavenging birds and mammals in California including hawks, owls, coyotes, foxes, mountain lions, and bobcats.

For more information on protecting wildlife from rodenticides, please read:

2 thoughts on “Results on the Coyote from Strawberry

  1. I absolutely agree, Dale. We are trying to get additional regulations in California. About a year ago, the director recommended to the California Department of Pesticide Regulation (DPR) that materials containing brodifacoum, bromadiolone, difethialone, and difenacoum be made restricted materials, which means only certified applicators could buy them and apply them. We are still waiting to hear what action will be taken by DPR.

  2. Seems like the EPA ban effort is slow in coming and is unclear whether it will result in positive results for wildlife. Dale

    EPA to ban some rodenticides 8/24/12
    The U.S. Environmental Protection Agency is preparing to ban the sale of certain rodenticides (!OpenDocument) to the general public, a move which could help prevent one of the most frequent causes of pet poisoning.

    In addition to banning the most toxic anticoagulant rodenticides (brodifacoum, bromadiolone, difethialone and difenacoum), the agency also plans to stop the sale of most loose bait and pellet-form rodenticides to cut down on accidental poisonings of children and pets.

    The EPA set a June 4 2011 deadline for rat and mouse poison manufacturers to come up with products that would be safer for children, pets and wildlife. According to the agency, many producers abided by the EPA’s guidelines and developed safer bait delivery systems with less toxic bait. Several companies refused to change their products and the EPA is now taking steps to ban those companies from selling their products. The companies that EPA is targeting are:

    · Reckitt Benckiser Inc. (makers of D-Con, Fleeject, and Mimas rodent control products)
    · Woodstream Inc. (makers of Victor rodent control products)
    · Spectrum Group (makers of Hot Shot rodent control products)
    · Liphatech Inc. (makers of Generation, Maki, and Rozol rodent control products)
    According to the Merck Veterinary Manual, anticoagulant rodenticide poisoning is the most frequent cause of poisoning in pets. While older versions of anticoagulant rodenticides such as warfarin required multiple ingestions to result in toxicity, the latest products require only one feeding to be highly toxic.

    “New products have a longer biologic half-life and therefore prolonged effects (which require prolonged treatment),” according to Merck. “For example, the half-life in canine plasma of warfarin is 15 hr, diphacinone is 5 days, and bromadiolone is 6 days, with maximum effects estimated at 12-15 days. Brodifacoum may continue to be detectable in serum for up to 24 days.”


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