There are well-known aerodynamic and energetic benefits to flying in an orderly formation. By contrast, it seems that the flocking flight seen in pigeons is metabolically expensive. So why do they do it? See Letter p.494
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Spedding, G. The cost of flight in flocks. Nature 474, 458–459 (2011). https://doi.org/10.1038/474458a
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DOI: https://doi.org/10.1038/474458a