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How long is an orangutan pregnancy?

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An illustration of a female Bornean orangutan (Pongo pygmaeus) with long reddish-brown fur, hanging from tree branches with one arm extended upward and one leg hooked over a branch. A scale bar at the bottom shows lengths of 30 centimeters and 12 inches for size reference. — orangutan Female orangutans (Pongo) have the longest breeding interval of any mammal, giving birth on average once every eight years.

The gestation period for an orangutan is approximately eight months.1