1. Volume 20, Issue 14, Pages R590-R591 (July 2010)
Lions 
Craig Packer 
Current Biology 
Volume 20, Issue 14, Pages R590-R591 (July 2010)
DOI: /j.cub
Copyright © 2010 Elsevier Ltd Terms and Conditions

2. Figure 1
A gang attack during an intergroup encounter in Serengeti lions.
Lions are at their most cooperative when fighting against outsiders. Females form prides to defend joint territories; males form coalitions to gain exclusive access to female prides. (Photo: Ingela Jansson.)
Current Biology  , R590-R591DOI: ( /j.cub )
Copyright © 2010 Elsevier Ltd Terms and Conditions