76th Annual Meeting of the APS Division of Fluid Dynamics (November 19, 2023 — November 21, 2023)

V0058: Bird Flight

  • Z Jane Wang, Cornell University
DOI: https://doi.org/10.1103/APS.DFD.2023.GFM.V0058

In this unedited clip, we see 2 take-off flights, many maneuvering flight (landing, circulating, sideways flight, gliding, fighting for a post), and social behavior of birds.  The take-off decision seems to depend on one or two leaders. Once in air, a large group of birds fly collectively in circular motion. This coherent structure is not uniform, and contains many internal modes with different time scales. The circulatory motion has a time scale of about 10-20s. The decision for taking off,  for following the group, and for switching direction is harder to estimate, but the take-off sequence suggests it to be around a fraction of second. Not all birds prefer to be in a  large group. A small group of birds  prefers a larger social distance. 


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