“Take what you can, give nothing back.” — The Gibbon Code Robbie does his best Jack Sparrow run while fetching pieces of dried apricot. Next to humans, gibbons are the most bipedal primate. Gibbon arms and hands are so specialized for swinging through the trees that they can’t be used for walking on all fours like monkeys or gorillas. They must either swing or walk on two feet. | International Primate Protection League