Living systems coordinate their motion for survival at all scales. Although bio-chemical signals and environmental gradients are known to influence the networks at a collective level, mechanistic signal transmission through the moving medium is not clear. Here, we use aerodynamics to identify these signals at an individual organismic level. We elucidate a V-shaped flapping bird flock as a response to fluidic gradients in a modeled dipolar double gyre wake. Since wakes are universal in bird flight, our method applies to complex formations. The present work has implications in bio-inspired design, solution of dilemma in cooperative flight and collective cellular migration.
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