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Fossils were meticulously prepared to remove the surrounding matrix of rock and expose the skull, shoulder girdle and pectoral fins.

The shoulder girdle -- the configuration of bones and muscles that in humans support the movement of the arms -- is a classic example of an evolutionary 'novelty'.

Still, he cautions, knocking out this gene in another bird probably isn’t enough to produce such flight—this adaptation likely required several steps, including the changes in the shoulder girdle.

This feature – in addition to our loose shoulder girdle – makes humans the best throwers in the animal kingdom.

The scientists uncovered vertebrae, ribs and part of what would have been the dinosaur's chest and shoulder girdle.