MINNEAPOLIS (WCCO) – One bald eagle has died and another is in serious condition in Wisconsin and lead seems to be to blame.

The Dane County Humane Society in Madison is taking care of the sick eagle.

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Officials believe the birds were affected by lead poisoning.

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Both birds likely swallowed lead while feeding on deer or other wildlife that had been shot.

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The Humane Society is urging hunters to use copper bullets which don’t have the same toxic effects.