The First Denisovan Arm Bone Offers a New Clue to What These Ancient and Mysterious Humans Looked Like

Key Points:

• Scientists have identified a Denisovan radius bone for the first time, providing new anatomical insights into this ancient human species; the 4.5 cm fossil was found in Bianfu Cave, Yunnan Province, China, and dates to roughly 142,000 to 134,000 years ago.
• The radius exhibits a mix of Neanderthal-like and modern-human-like features, suggesting Denisovan arm biomechanics were unique, with a biceps attachment that may have allowed greater rotational force during forearm movement.
• Protein analysis, rather than DNA, was used to confirm the fossils' Denisovan identity due to DNA degradation in the cave's warm conditions, linking the radius, skull fragments, and teeth to the Denisovan lineage through collagen variants.
• Alongside the fossils, researchers uncovered over 1,300 stone tools and animal bones with butchery marks, indicating Denisovans were active hunters who used expedient toolmaking techniques and bone tools.
• This discovery, combined with previous findings like the Harbin skull and leg bones, helps fill significant gaps in understanding Denisovan anatomy and lifestyle, bringing this elusive human group closer to a tangible, recognizable presence.