Minneapolis (WCCO) – Minnesota’s Audubon Society says thousands of people are concerned about birds hitting the large glass windows that will be in the new Vikings Stadium.

This morning, the Audubon Society delivered more than 70,000 signatures in a petition to Gov. Mark Dayton’s office.

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“Gov. Dayton has called it the people’s stadium,” an Audubon spokesperson said, “and these are the signatures of the people and now we want the people’s government to make the stadium safe for the people’s birds.”

The society says they want specially glazed bird-safe glass installed in the stadium to protect the lives of thousands of birds.

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The Audubon Society says adding bird-safe glass to the the billion dollar stadium will add about $1million in extra cost.

But the Vikings say the special glass, which incorporates what appear to be large polka dots, will destroy the open-feel design of the building.

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The Vikings have agreed to turn off stadium lights at night during migration season.