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Rat poison from marijuana farms is harming federally threatened northern spotted owls, study finds

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A northern spotted owl sits in a tree in the Deschutes National Forest near Camp Sherman, Ore. (Don Ryan / Associated Press)

Rat poison from marijuana farms is harming federally threatened northern spotted owls, study finds 

Los Angeles Times

Seven of 10 spotted owls and 34 of 84 barred owls collected between 2009 and 2013 tested positive for anticoagulant rodenticides, the study published Thursday in the journal Avian Conservation and Ecology shows. The study area encompassed Humboldt, Mendocino and Del Norte counties, a region where increasing numbers of marijuana cultivation sites overlap with the owls’ hunting grounds.