Hierarchical group dynamics in pigeon flocks

@article{Nagy2010HierarchicalGD,
  title={Hierarchical group dynamics in pigeon flocks},
  author={M{\'a}t{\'e} Nagy and Zsuzsa {\'A}kos and Dora Biro and Tam{\'a}s Vicsek},
  journal={Nature},
  year={2010},
  volume={464},
  pages={890-893}
}
Animals that travel together in groups display a variety of fascinating motion patterns thought to be the result of delicate local interactions among group members. Although the most informative way of investigating and interpreting collective movement phenomena would be afforded by the collection of high-resolution spatiotemporal data from moving individuals, such data are scarce and are virtually non-existent for long-distance group motion within a natural setting because of the associated… 

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