Fossils show primitive birds used fore and hind limbs for flight. Four wings good, two wings bad: An artist's impression of Sapeornis, a genus of
primitive bird that lived 125 to 120 million years ago. About 33cm from head to tail, it had feathered fore and hind limbs. The reconstruction is
based on fossils from northeastern China. Source - www.irishtimes.com...
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