Skip to main content
U.S. flag

An official website of the United States government

Researchers found that turkey vultures and common ravens throughout Oregon have been exposed to rodent poison, with possible implications for the newly established northern California condor flock.

Anticoagulant rodenticides are widespread environmental contaminants that pose risks to avian scavengers that eat poisoned prey. There are concerns over the potential effects anticoagulant rodenticide exposure on avian scavenger populations, and in particular, the California condor flock recently established in northern California. Researchers from the USGS and USFWS measured anticoagulant rodenticides in the liver tissue of common ravens and turkey vultures throughout Oregon between 2013 and 2019. The livers of 51% of common ravens and 86% of turkey vultures contained anticoagulant rodenticides. Higher levels of anticoagulant rodenticides were associated with lower body weight in females of both species. These results suggest that avian scavengers in Oregon are experiencing extensive anticoagulant rodenticide exposure and the northern California condor population may also be exposed if they feed in southern Oregon.   

Herring, G., Eagles-Smith, C.A., and Buck, J.A., 2023, Anticoagulant rodenticides are associated with increased stress and reduced body condition of avian scavengers in the Pacific Northwest: Environmental Pollution, v. 331, Part 2, Online. 

Get Our News

These items are in the RSS feed format (Really Simple Syndication) based on categories such as topics, locations, and more. You can install and RSS reader browser extension, software, or use a third-party service to receive immediate news updates depending on the feed that you have added. If you click the feed links below, they may look strange because they are simply XML code. An RSS reader can easily read this code and push out a notification to you when something new is posted to our site.