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How far can an orangutan long call be heard?

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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 long call of an adult male orangutan can sometimes be heard for up to 2 km (1.2 miles). This vocalization, which is produced using a specialized throat pouch that acts as a resonating chamber, serves to space out males and attract sexually receptive females.1