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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