Rare Denisovan fossils and tools unearthed in Chinese cave offer new insights into extinct cousins

For most of human prehistory, the Denisovans were ghosts—known only through fragments of DNA embedded in the genomes of modern Indigenous Australians and a scattering of bones found across Asia. Then, in 2019, archaeologists racing against time pulled seven Denisovan fossils from a cave in southwestern China before the mountain itself collapsed.

The cave, called Bianfu, sits in Yunnan province. Nearby quarrying operations were destabilizing the rock, threatening to seal the site forever. Working urgently, researchers extracted roughly 60,000 bone fragments and thousands of stone tools before the entrance was destroyed and the cave rendered inaccessible. Among those fragments, scientists identified seven pieces bearing the protein signature of Denisovans: an arm bone, two skull shards, and four teeth. Dating of the sediment layers placed these remains between 134,000 and 167,000 years old, though the cave itself showed signs of occupation stretching back 190,000 years and continuing until about 70,000 years ago.

What makes this discovery unusual is not the fossils alone—it is what surrounded them. Previous Denisovan sites have been muddied by the presence of other early humans, Neanderthals and Homo sapiens alike, making it nearly impossible to know which tools or bones belonged to which species. At Bianfu Cave, the fossils came with a complete archaeological context: thousands of artifacts, animal bones bearing butchering marks, and pollen samples that painted a picture of the environment. Bo Li, an archaeologist at the University of Wollongong and co-author on the papers describing the find, noted that this combination allowed researchers to study Denisovan biology, technology, diet, and adaptation all at once—something rarely possible before.

The evidence suggests a particular way of life. Pollen and animal remains indicate the Denisovans inhabited a forested landscape dominated by conifers, an environment that was relatively stable and predictable. They hunted large game—deer and water buffalo—bringing the carcasses back to the cave or processing them there for meat, marrow, and fat. The bones themselves bore the marks of this work: cuts and scratches from stone and bone tools that resembled implements used by Neanderthals. The Denisovans were not passive inhabitants of their world but active hunters who had developed the technology to bring down substantial prey.

Yet Li cautioned against drawing sweeping conclusions from a single site. The Denisovans ranged across an enormous territory, from Siberia through Tibet and into Southeast Asia, suggesting they were capable of adapting to diverse environments. Whether the hunting practices and tool kits found at Bianfu Cave were typical of all Denisovans, or unique to this particular population, remains an open question. More sites, more fossils, more context would be needed to answer it.

Mike Morley, an archaeologist at Flinders University not involved in the discovery, called it exciting precisely because it showed Denisovans were not confined to the frozen reaches of Siberia—the only place they had been known from before. The loss of Bianfu Cave to quarrying is a genuine tragedy, he acknowledged, but the urgency of the excavation and the richness of what was recovered before the collapse suggest that other sites are waiting to be found. Denisovan research, he predicted, would accelerate. It may not take long before another cave yields its secrets.