Growers bait open tuna cans with pesticides, which are often flavored like meat or peanut butter, or string up poisoned hot dogs on fishhooks. People have found bears, foxes, vultures, and deer with chemicals from grow sites in their bodies. One study of barred owls (Strix varia) in the Pacific Northwest found that 80 percent of the birds tested positive. And for every animal found, there are probably dozens more in a similar condition.
“It’s a massive problem,” says Craig Thompson, a wildlife ecologist with the U.S. Forest Service. “People don’t tend to grasp the industrial scale of what’s going on. There are thousands of these sites in places the public thinks are pristine, with obscene amounts of chemicals at each one. Each one is a little environmental disaster.”
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