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The earliest birds did not have strong enough feathers to take to the air by flapping their wings and were gliders at best, researchers said Thursday.
While modern birds have feathers with a strong central shaft that is hollow to reduce weight, the earliest-known bird Archaeopteryx and another ancient ancestor had feathers that were much thinner and weaker.
The earliest birds did not have strong enough feathers to take to the air by flapping their wings and were gliders at best, researchers said Thursday.