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12 animals with the longest gestation period

Manatee

Photo: spakattacks/Flickr

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Manatees

You might not know if a portly manatee is pregnant simply by looking at the animal, but this gentle giant carries its young for nearly 13 months. Lounging around in the water all day helps to relieve some of the extra weight, but a manatee mother is still owed plenty of respect for her patience.