Food and formation help birds fly efficiently.
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References
Kvist, A., Lindstrom, A., Green, M., Piersma, T. & Visser, G. H. Carrying large fuel loads during sustained bird flight is cheaper than expected.Nature 413, 730 - 732 (2001).
Weimerskirch, H., Martin, J., Clerquin, Y., Alexandre, P. & Jiraskova, S.. Energy saving in flight formation.Nature 413, 697 - 698 (2001).
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University of Aberdeen
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Klarreich, E. Birds fly best on a full tank. Nature (2001). https://doi.org/10.1038/news011018-10
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DOI: https://doi.org/10.1038/news011018-10