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07/26/2013 06:24 EDT | Updated 09/25/2013 05:12 EDT

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OAKLAND, Calif. - Birds and buildings can be a fatal combination. The American Bird Conservancy cites studies estimating that hundreds of millions of birds die each year as a result of colliding with walls and windows.

But a movement to make skies a little friendlier is taking flight; some cities and other governments across the country are adopting bird-safety building guidelines on a mandatory or voluntary basis.

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