Evolution Of Bird Flight

From the Paper:

" The evolution of bird flight is one of the most dramatic events in the evolution of animals since the evolution of land life from aquatic forms. One of the challenges of theorists is to explain how this evolution may have occurred and how flight benefits birds. While advantages to flight can be sought, there is also need to explain why birds such as the emu of Australia, kiwi of New Zealand and African ostrich are flightless. Any attempt to find evolutionary advantage in flight must also take account of these birds that do not fly.
The general consensus is that cold-blooded reptiles are the most immediate ancestors of warm-blooded birds. However, the fossil record has not yielded evidence indicating how the front legs of reptiles became transformed into the wing of the bird. Archaeopteryx, the first known fossil bird, had a long bony tail(...)"

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