In Nature today http://www.nature.com/news/v-is-for-vortex-1.14507, http://www.nature.com/nature/journal/v505/n7483/full/505295a.html, and http://www.nature.com/nature/journal/v505/n7483/full/nature12939.html
describe instrumenting juvenile northern bald ibis raised in captivity to measure their effort as they learn to fly in a V formation. When they get it right, the wing strokes are staggered in time so each bird, except the leader, gets a lift off the trailing vortex of the bird ahead. -- rec --
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