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Panda Pregnancy Watch at the National Zoo

File photo. (iStockphoto/Thinkstock)(WASHINGTON) -- There is a panda watch under way at the National Zoo in Washington, D.C.

Scientists say the female giant panda may be pregnant. She has been building a nest, is sensitive to noise and her hormone levels are high.

The zoo has closed part of the panda exhibit so she can have some privacy.

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