Bird feathers preserved in amber from 99 million years ago provide evidence that modern birds are descended from dinosaurs and shed light on why some of their ancestors went extinct. The feathers, belonging to a bird named Enantiornithine, show the first fossil example of juvenile molting in birds. Molting was a key factor in the extinction of this species, as it required high energy demands to stay warm during the shedding process. The study suggests that molting patterns may have played a role in the survival or extinction of different dinosaur groups.

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