Complex cooperation among territorial lions

Using simulated intrusions, this study examined how lionesses behave when their pride must repel rivals. Individuals differed consistently: some females reliably led the advance toward broadcast roars while others lagged behind, yet leaders did not punish laggards. The persistence of these roles challenges simple reciprocity models and suggests cooperation in lions is shaped by individual differences in boldness rather than tit-for-tat accounting. The work became a touchstone for debates about how cooperation is maintained when cheating appears to go unpunished, and it remains widely cited in discussions of personality, collective action, and the evolution of group living in social carnivores.