Forced to crowd or choosing to cluster? Spatial distribution indicates social attraction in broiler chickens (2006)

Febrer, K., Jones, T. A., Donnelly, C. A. et al.

Abstract

At all stocking densities, chickens were more clustered than indifferent (randomly distributed) chickens, and their distribution best fitted a social attraction model in which simulated birds rejected a potential position if their distance from other birds was too great.