Volume 20, Issue 14, Pages R590-R591 (July 2010) Lions  Craig Packer  Current Biology  Volume 20, Issue 14, Pages R590-R591 (July 2010) DOI: 10.1016/j.cub.2010.05.003 Copyright © 2010 Elsevier Ltd Terms and Conditions

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 2010 20, R590-R591DOI: (10.1016/j.cub.2010.05.003) Copyright © 2010 Elsevier Ltd Terms and Conditions