Flap-running in birds is key to flight evolution

The ungainly sight of a bird furiously flapping its wings as its spindly legs propel it forward could be a peek at evolutionary history. "Flap-running", researchers say, may have been a key step in the evolution of flight. Experiments with pigeons have shown that it helps birds ascend slopes and suggests the earliest flightless birds might have used the same technique.


 running wing bird flying evolution

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