The birds take turns, according to scientists
February 3, 2015 Last update on 05:50 GMT
Scientists have sociable to determine how that which leads the "social dilemma" developed called the flock.
The researchers from the United Kingdom, Germany and Austria, studied the bald ibis, tracking, how - how many large birds - flying in V formation
They found that birds to lead very stressful energy alternately.
This allowed the birds to enjoy an extra boost by the wings of the bird before produced.
The findings are published in the Proceedings of the National Academy of Sciences.
Informa Victoria Gill.
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