Selfish-herd behaviour of sheep under threat

  • King A
  • Wilson A
  • Wilshin S
 et al. 
  • 162


    Mendeley users who have this article in their library.
  • 40


    Citations of this article.


Flocking is a striking example of collective behaviour that is found in insect swarms, fish schools and mammal herds. A major factor in the evolution of flocking behaviour is thought to be predation, whereby larger and/or more cohesive groups are better at detecting predators (as, for example, in the 'many eyes theory'), and diluting the effects of predators (as in the 'selfish-herd theory') than are individuals in smaller and/or dispersed groups. The former theory assumes that information (passively or actively transferred) can be disseminated more effectively in larger/cohesive groups, while the latter assumes that there are spatial benefits to individuals in a large group, since individuals can alter their spatial position relative to their group-mates and any potential predator, thus reducing their predation risk. We used global positioning system (GPS) data to characterise the response of a group of 'prey' animals (a flock of sheep) to an approaching 'predator' (a herding dog). Analyses of relative sheep movement trajectories showed that sheep exhibit a strong attraction towards the centre of the flock under threat, a pattern that we could re-create using a simple model. These results support the long-standing assertion that individuals can respond to potential danger by moving towards the centre of a fleeing group.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Andrew KingSwansea University Department of Biosciences

  • Alan M. Wilson

  • Simon D. Wilshin

  • John Lowe

  • Hamed Haddadi

  • Stephen Hailes

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free