Bird feathers preserved in 99-million-year-old amber from Myanmar are providing new evidence for the link between birds and dinosaurs. The feathers offer insights into the evolutionary history of modern birds and shed light on factors contributing to the extinction of their ancestors. The discovery represents the first fossil evidence of juvenile molting in birds, indicating that molting played a significant role in the survival and demise of different dinosaur groups. The findings suggest that prehistoric birds molted differently from modern birds, possibly molting less frequently or simultaneously rather than following a yearly cycle.

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