The Orang Utan
The great red-haired Orang Utan of Borneo and Sumatra is the heaviest tree-dweller in existence. A male may stand over one and a half metres tall, have arms with a spread of two and a half metres and weigh a massive 200 kilograms. The digits on all four limbs have powerful grips, so that the animal is best described as being four-handed and the ligaments of the hip joints are so long and loose that an Orang utan, particularly when it is young, can stick its legs out at astonishing angles. Plainly, they are excellently adapted for the arboreal life.