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Why Do Birds Fly in a V-Formation?

posted by Jason Kottke   May 16, 2019

Many species of migratory birds, like the Canada goose in North America, fly in a v-formation. Scientists have long suspected that there was some energy-saving advantage to flying in formation and a 2014 study provides evidence to that effect.

By comparing the birds’ flight data to computer simulations, Portugal found that the ibises are apparently drafting — catching an uprush of air from the wingtip of the bird ahead. “Furthermore, when they’re in that position, they time wing beats perfectly,” he says. “So they don’t just sit there passively hoping to get some of the good air from the bird in front.”

They actually flap along the perfect sweet spot. Portugal thinks there’s a very good reason why the ibises do this. Previous studies have shown that flying is hard work.

“When we get exercising, our heart rate gets up to around 180 beats per minute on a good day,” Portugal says. “When birds are flying, it goes up to 400 beats per minute.”

You can read the paper published by the researchers in Nature. (via the kid should see this)