Study blames marijuana farms for poisoning of threatened northern spotted owls in Northern California

SAN FRANCISCO — Rat poison is contaminating threatened northern spotted owls in California forests and marijuana farms appear to be to blame, according to a study published Thursday.

The study published in the journal Avian Conservation and Ecology focused on owls in Northern California’s Humboldt, Mendocino and Del Norte counties, part of the so-called Emerald Triangle, where remote farms — many in old-growth forests — produce much of the marijuana grown for the U.S. black market.

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Researchers from the University of California, Davis, and the California Academy of Sciences tested 10 northern spotted owls

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