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Lead shot from decades ago likely culprit in poisoning of Blue Lake waterfowl
Small fragments of lead were found in the birds, which conservationists believe are from lead bullets shot decades ago
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Earlier this month, visitors at the Minnesota Valley National Wildlife Refuge noticed a concerning trend: dead birds strewn about near Blue Lake in Shakopee.
This week, the refuge reported that the eight birds   including swans, mallards and Canada geese   tested positive for lead poisoning. The necropsy showed what appeared to be lead shot fragments, said refuge manager Sarena Selbo. 
Before the refuge was founded, waterfowl hunting had been popular along the Minnesota River. While lead shot has been banned for waterfowl hunting since the late 80s, fragments can linger at the bottom of lakes, Selbo said. While it s unclear if the birds ingested the lead in Blue Lake, the lake s water levels were recently drawn, which could have shifted some lead shot b ....

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