Environment
Early birds may have dropped teeth to get airborne
Fad dieting wasn't an option in the Cretaceous, so the earliest birds went to more extreme measures to address weight issues
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Fad dieting wasn't an option in the Cretaceous, so the earliest birds went to more extreme measures to address weight issues
The record for the oldest feathered dinosaur, which has stood since discovery of Archaeopteryx, has fallen to an older fossil unearthed in China