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How often do wild female orangutans usually give birth?

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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.

Female orangutans have the longest breeding interval of any mammal. In the wild, they give birth on average once every eight years.1