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12 animals with the longest gestation period

April 28, 2010, 1:22 p.m.
Gorilla crawls on its mother's back

Photo: jupiterimages

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Here's to mothers

We owe a lot to our mothers. They carried us for about nine months before giving birth. Human mothers have a relatively long gestation period compared to the rest of the animal kingdom, but a few animal mothers go even further. Here's our list of the 10 animals with the longest gestation periods. (Text: Bryan Nelson and Julie Knapp)