The biggest ape that ever lived was not too big to fail

Standing nearly as tall as a basketball hoop and weighing as much as a grizzly bear, Gigantopithecus blacki was the greatest ape to ever live. For more than a million years during the Pleistocene, Gigantopithecus roamed southern China. But by the time ancient humans reached the region, Gigantopithecus had vanished.

To determine why these prodigious primates died out, a team of scientists recently analysed clues preserved in Gigantopithecus teeth and cave sediment. Their findings, published Wednesday in the journal Nature, reveal that these nearly 10-foot-tall apes were most likely doomed by their specialised diet and an inability to adapt to a changing environment.

Paleontologists first discovered Gigantopithecus in the mid-1930s in a Hong Kong apothecary where the ape’s unusually large molars were being hawked as “dragon teeth.” The animal was named to honor Davidson Black, the Canadian scientist who studied the early human ancestor known as Peking man. In the decades since, scientists have unearthed about 2,000 Gigantopithecus teeth and a handful of fossil jawbones from caves throughout southern China.

The dearth of fossilised bones makes reconstructing Gigantopithecus difficult; paleoartists depict the ancient ape as looking like an orangutan (its closest living relative) crossed with a silverback gorilla, but bigger. Nevertheless, the very great ape’s teeth, which are encased in a thick layer of enamel, preserve a wealth of clues to how these enigmatic primates lived and potentially why they died out.

Yingqi Zhang, a paleontologist from the Institute of Vertebrate Palaeontology and Palaeoanthropology in Beijing and an author on the new paper, has studied Gigantopithecus fossils for more than a decade. To determine what drove them to extinction, Dr. Zhang needed to nail down exactly when Gigantopithecus disappeared. He teamed up with Kira Westaway, a geochronologist at Macquarie University in Australia. “Establishing exactly when Gigantopithecus drops out the fossil record requires accurate dating — otherwise, you are looking for clues to its extinction in the wrong places,” Dr Westaway said. The team collected and dated material from 22 caves across southern China. To fine-tune the ages of the fossils and the cave sediments, the researchers applied six dating techniques. They also analysed isotopes and pollen in the samples to recreate what the region’s environment was like around the time Gigantopithecus disappeared. Finally, they compared wear patterns in the oversized teeth with fossilised teeth from Pongo weidenreichi, an extinct orangutan that lived alongside Gigantopithecus.

Gigantopithecus, they say, went extinct between 295,000 and 215,000 years ago. Those dates were much more recent than previous estimates and coincide with a dynamic period of environmental change. According to Sergio Almécija, a paleoanthropologist at the American Museum of Natural History who was not involved in the new research, the demise of Gigantopithecus reveals that even the largest animals are vulnerable to becoming too specialised. “These apes became so specialised to living in a specific environment that once that environment changes, they’re gone,” he said.