Study
Effective leadership and decision-making in animal groups on the move
Couzin, Iain D.; Krause, Jens; Franks, Nigel R.; Levin, Simon A.
Nature, 2005
A model of moving groups in which a proportion of individuals have a preferred direction and the rest simply follow local rules. The proportion of informed individuals, and the strength of their preference, were varied, and the accuracy of the group’s movement recorded.
- Studied in
- Animalia
- Sample size
- simulated groups across informed-minority proportions
A small proportion of informed individuals was sufficient to guide a large group accurately, with the required proportion falling as group size increased. Informed individuals needed no signal identifying them and no recognition by the others.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Effective leadership can emerge without signalling, recognition, or any individual being identifiable as a leader.
How NatureHQ reads it
Carried as a model and labelled as one. It matters because it removes the assumption that a coordinated group must have a leader that others can identify: a few individuals who simply keep heading somewhere are enough. Whether real flocks work this way is a separate question this study does not answer.
- A simulation, not a measurement of any animal.
- Shows that a mechanism is sufficient in a model, not that any species uses it.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Published by: Nature PortfolioPublished in a Nature Portfolio journal.
Checked against Crossref on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-09-03.