Flocks accomplish a feat of coordination to save energy during migration.
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References
Portugal, S. J. et al. Nature http://dx.doi.org/10.1038/nature12939 (2014).
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Wald, C. Precision formation flight astounds scientists. Nature (2014). https://doi.org/10.1038/nature.2014.14537
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DOI: https://doi.org/10.1038/nature.2014.14537