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Bird flocks exhibit anisotropic forces, with stronger attraction sideways than forwards. Turning to avoid collisions, rather than changing speed, shapes flock formations.

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Area of Science:

  • Animal Behavior
  • Biophysics
  • Collective Motion

Background:

  • Bird flocking is a complex collective behavior with extensive research.
  • Understanding the attractive and repulsive forces governing individual interactions within flocks remains a challenge.
  • The influence of these forces on neighbor positioning and overall flock shape requires further investigation.

Purpose of the Study:

  • To analyze the three-dimensional movements of wild jackdaws (Corvus monedula) in flocks.
  • To quantify social interaction forces in large, airborne flocks.
  • To determine how anisotropic forces influence flock structure and dynamics.

Main Methods:

  • Analysis of the 3D flight paths of wild jackdaw flocks (2-338 individuals).
  • Quantification of social interaction forces, examining anisotropy.
  • Investigation of the energetic costs associated with changes in speed versus direction.

Main Results:

  • Social interaction forces in jackdaw flocks are highly anisotropic.
  • Long-range attraction is stronger perpendicular to the direction of movement.
  • Short-range repulsion primarily results from turning, not speed adjustment, due to lower energetic cost.

Conclusions:

  • Anisotropic interaction forces significantly influence flock shape and structure.
  • Collision avoidance through turning alters local neighbor distributions and group morphology.
  • Results link individual locomotion biophysics to macroscopic flock behavior and structure.