The confusion effect when attacking simulated three-dimensional starling flocks

Benedict G Hogan, Hanno Hildenbrandt, Nick Scott-Samuel, Innes Cuthill, Charlotte Hemelrijk

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Citations (Scopus)
317 Downloads (Pure)


The confusion effect describes the phenomenon of decreasing predator attack success with increasing prey group size. However, there is a paucity of research into the influence of this effect in coherent groups, such as flocks of European starlings (Sturnus vulgaris). Here, for the first time, we use a computer game style experiment to investigate the confusion effect in three dimensions. To date, computerized studies on the confusion effect have used two-dimensional simulations with simplistic prey movement and dynamics. Our experiment is the first investigation of the effects of flock size and density on the ability of a (human) predator to track and capture a target starling in a realistically simulated three-dimensional flock of starlings. In line with the predictions of the confusion effect, modelled starlings appear to be safer from predation in larger and denser flocks. This finding lends credence to previous suggestions that starling flocks have anti-predator benefits and, more generally, it suggests that active increases in density in animal groups in response to predation may increase the effectiveness of the confusion effect.
Original languageEnglish
Article number160564
Number of pages9
JournalRoyal Society Open Science
Issue number1
Early online date18 Jan 2017
Publication statusPublished - Jan 2017

Structured keywords

  • Cognitive Science
  • Visual Perception


  • confusion effect
  • starling flocking
  • target tracking
  • realistic three-dimensional computer simulations


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