A flock of geese in the San Francisco Bay Area were likely exposed to an anticoagulant rodenticide, according to findings released in February from a postmortem examination by the California Department of Fish and Wildlife’s (CDFW) Wildlife Health Lab (WHL). In the fall of 2020, approximately ten Canada Geese shot by hunters in Contra Costa County were found to have blue-colored fat. The WHL conducted an examination on one of the carcasses and detected diphacinone, an anticoagulant rodenticide, in the goose’s liver. CDFW encourages hunters to report any unusual findings in harvested wildlife and not to consume any part of an animal with blue fat or other abnormality. Incidents may be reported to the CDFW’s Wildlife Health Lab at WILab@wildlife.ca.gov or (916) 358-2790. If you have concerns about pesticide misuse related to wildlife poisoning, would like to report a pesticide-related issue, or have questions about pesticide regulations, please contact the Contra Costa County Department of Agriculture at email@example.com or (925) 608-6600.
Further details can be found in this CDFW press release (PDF)