In the top image, a complete dromaeosaur fossil, dated about 128 million years old, is shown in a rock slab discovered in Liaoning Province in northeast China. Scientists say it is the first fossil of a nonflying dinosaur that had feathers with the same features as modern birds, demonstrating the evolutionary link between dinosaurs and birds. The fossil is about 3 feet long. The bottom image magnifies a single feather. A trained eye can see the feather's central shaft, or rachis, and the branching barbs that hook together feathery filaments.

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