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12 animals with the longest gestation period

By: Bryan Nelson on April 28, 2010, 1:22 p.m.
A manatee calf and its mother

Photo: Liquid Productions, LLC/Shutterstock

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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.