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Cretaceous-era bird tracks: Proof of 100-million-year-old flight?

Dinosaur-era bird tracks: Proof of 100-million-year-old flight? (via The Christian Science Monitor) Photograph (l.) and interpretive drawing (r.) of the four-toed footprint and the groove behind it. The diagram numbers each toe from I (hallux) to IV, outlines the overall form, and shows the main direction of movement as the…

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