Orangutans, Ferris Jabr writes, possess an extraordinary intellect and have demonstrated a capability for cultural learning:
"At Camp Leakey, the orangutans had plenty of opportunity to observe and imitate people. They soon developed a habit of stealing canoes, paddling them downriver, and abandoning them at their destinations. Even triple and quadruple knots in the ropes securing the canoes to the dock did not deter the apes."
Photograph by Patrick Stollarz/AFP/Getty