How dinosaur arms turned into bird wings
Santiago, Chile (SPX) Oct 01, 2014 - Although we now appreciate that birds evolved from a branch of the dinosaur family tree, a crucial adaptation for flight has continued to puzzle evolutionary biologists. During the millions of years that elapsed, wrists went from straight to bent and hyperflexible, allowing birds to fold their wings neatly against their bodies when not flying. How this happened has been the subject of much ... more
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