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12 animals with the longest gestation period

By: Bryan Nelson on April 28, 2010, 1:22 p.m.

Photo: exfordy/Flickr

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Elephants have the longest gestation period of all mammals, carrying their young for nearly two years before giving birth. Long developmental periods are common among highly intelligent animals. Since elephants are the largest living and biggest-brained land animal in the world, there's a lot of developing for elephants to do in the womb.