Chinese fossil find shows birds shed their dinosaur tails step by step
Researchers in China have discovered a 150-million-year-old fossil, Zhengheornis buyu, which provides evidence that birds evolved their short, fused tails through a gradual process. This finding challenges previous theories that the transition from long dinosaur tails to modern bird tails happened suddenly.
Why it matters
This discovery fills a significant gap in the evolutionary history of birds, clarifying how they developed the aerodynamic structures necessary for flight.
A fossil found in China suggests modern birds shed the long, bony tails of their dinosaur ancestors through a step-by-step process, rather than a sudden evolutionary transition as previously believed.
The transition to a short, feathered tail was one of the most important steps in the evolution and survival of birds, the only living group of dinosaurs to survive a mass extinction event 66 million years ago.
“The evolutionary assembly of the flight-adapted bird body plan encompasses some of the most profound morphological changes in terrestrial vertebrate history,” a team of Chinese researchers said in their paper published in the peer-reviewed journal Science Advances on July 1.
Unlike most non-avian dinosaurs, modern birds have a pygostyle, which is a skeletal structure formed by the fusion of the final few caudal or tail vertebrae. This short tail structure acts as an anchor for tail feathers and muscles.
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