Data from: Three-dimensional trajectories and network analyses of group behaviour within chimney swift flocks during approaches to the roost

Dennis J. Evangelista, Dylan D. Ray, Sathish K. Raja & Tyson L. Hedrick
Chimney swifts (Chaetura pelagica) are highly manoeuvrable birds notable for roosting overnight in chimneys, in groups of hundreds or thousands of birds, before and during their autumn migration. At dusk, birds gather in large numbers from surrounding areas near a roost site. The whole flock then employs an orderly, but dynamic, circling approach pattern before rapidly entering a small aperture en masse. We recorded the three-dimensional trajectories of ≈1 800 individual birds during a 30...
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