The ancestors of birds flew on all fours

The ancestors of birds took to the skies by gliding from trees using feathered wings on their arms and legs, according to a research by a paleontologist from the University of Calgary. Dinosaur-like bird Archiopteryx appears to have taken to the skies with four wings .Nick Longrich , the paleontologist challenges the earlier accepted idea that birds began flying by taking off from the ground while running.

http://www.sciencedaily.com/releases/2006/09/060922094617.htm

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