Rat poison used to keep rodents out of illegal marijuana growing operations in California could be killing fishers in the state. A new study conducted by biologists from the University of California-Davis found that nearly 80 percent of the fishers they found dead in the wild had been exposed to rat poison. The biologists believe illegal marijuana cultivation in the remote areas where the animals live is the most likely origin of the chemicals found in the fishers, according to a California Watch story by Andrew Becker.
The biologists are also concerned about the effects of rat poison on the Sierra Nevada red fox, wolverine, gray wolf and various owl species. With an increase in illegal marijuana growth operations in the state and declining fisher numbers, the biologists warn that the issue must be addressed quickly.