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Duck gestation period

What the gestation period of a duck is?? A friend has a duck that's been sitting on her nest for a week and has not eaten. is this normal?

Birding Expert - George H. Harrison

The incubation period for mallards is 23 to 29 days; other duck species are similar. The fact that the hen has not eaten is unusual. Hens usually leave the nest a couple of times a day for short periods, a hour or less, to feed.

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