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Nature's 10 best animal dads

By: Bryan Nelson on June 15, 2011, 1:03 p.m.
A pregnant seahorse in an aquarium tank.

Photo: Sheena Koontz/Shutterstock

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Seahorses are unique because they belong to a fish family known for an oddity: male pregnancy.

Male seahorses have a pouch where females deposit their eggs. Once deposited, the male fertilizes the eggs and incubates them for a period of up to 45 days, until they emerge as fully developed little seahorses. Seahorse fathers even experience contractions as they give birth.