Gigantopithecus

Gigantopithecus is an extinct genus of ape that lived from around 1 million to 300,000 years ago alongside Homo erectus in what is now China, India, and Vietnam. Gigantopithecus blacki was the largest primate species ever, standing up to just under 10 feet and weighing in at 1,200 pounds.

Since no pelvis or leg bones have been found, no one knows for sure whether Gigantopithecus walked on all fours or stood on its hind legs. The majority view is that it was quadrupedal, though some suggest it was bipedal. The scientists who favor the bipedal view point to the few jawbones discovered which are all U-shaped and widen towards the rear. This would make space for the windpipe to be within the jaw and allow the skull to sit squarely upon a fully-erect spine.

Gigantopithecus blacki has also been popular with the Bigfoot theory.