This wrist’s twist is its link between dinosaurs and birds
Peer-Reviewed Publication
Updates every hour. Last Updated: 20-Oct-2025 03:11 ET (20-Oct-2025 07:11 GMT/UTC)
The evolutionary path from dinosaurs to birds included the development of a tiny wrist bone that ultimately proved crucial for stabilizing wings in flight. A new study suggests that the bone appeared in bird ancestors millions of years earlier than first thought.
Paleontologists at Yale and Stony Brook University led a research team that made the discovery after examining fossils from two species of bird-like dinosaurs — an unnamed troodontid and a Citipati from the Late Cretaceous period 66 to 100 million years ago — found in the Gobi Desert in Mongolia. The findings were published in the journal Nature.
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