Gigantopithecus ("giant ape") is an extinct genus of ape that existed from roughly one million years to as recently as three hundred thousand years ago, in what is now China, India, and Vietnam, placing Gigantopithecus in the same time frame and geographical location as several hominin species. The fossil record suggests that the Gigantopithecus blacki species were the largest apes that ever lived, standing up to 3 metres, and weighing up to 540 kilograms. The genus has entered the popular culture lexicon as a result of cryptozoologic claims that Gigantopithecus survives in remote parts of Asia and the Americas even today and is known variously as the yeti, the yeren, the mande-barung, the sasquatch, and the skunk ape.
Shirou's History Fact
The largest of all the primates in history. Only fossils of its jaws and teeth have been discovered, but judging from the size of its teeth, it's about twice the size of modern gorillas. It's an omnivore that lived on the ground in caves. They're not ancestors of modern homo sapiens, but come from a different line of anthropoid fossils. There are also theories that these still exist today, and are living in the Himalayas and the area surrounding it.
Gigantopithecuses were first encountered by Makoto's Group heading towards The Tower. Soon after them, Akira's Group follows the route they used and encounters also Gigantopithecuses.