Comparisons of Three Long Bones Between Fossil (Left) and Modern (Right) Eastern Bluebird (IMAGE)

Proceedings of the National Academy of Sciences

Comparisons of Three Long Bones Between Fossil (Left) and Modern (Right) Eastern Bluebird

Caption

These are comparisons of three long bones between fossil (left) and modern (right) Eastern Bluebird.

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<i>PNAS</i>

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