Takeoffs a problem for giant bird

Weighing in at 150 pounds or more, the all-time biggest bird couldn't just hop into the air and fly away, researchers say. A team led by Sankar Chatterjee of Texas Tech University used computer programs originally designed for aircraft to analyze the probable flight characteristics of Argentavis magnificens, a giant bird that lived in South America 6 million years ago. Like today's condors and other large birds, Argentavis would have had to rely on updrafts to remain in the air.

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