Feathers linked ground-dwellers to modern birds, revealing a stepwise transition from dinosaur to flighted life.
Early theropods wore primitive feathers, hinting at insulation and signaling rather than flight.
Archaeopteryx fused dinosaur and bird traits, reshaping views on origin and function of feathers.
China's Liaoning fossils reveal diverse feathered dinosaurs, foreshadowing multiple flight paths.
Key bones and joints evolved toward flight, from shoulder shifts to fused wrists and tail shortening.
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