Male lions in large coalitions gain reproductive advantages

This landmark analysis showed that the size of a male lion coalition strongly predicts its tenure over prides and its lifetime reproductive output. Larger coalitions, often formed by littermates or cohort companions, hold prides longer, sire more surviving cubs, and resist takeovers more effectively than pairs or singletons. The authors linked coalition formation to kin selection because most large groups contain close relatives, so even non-breeding members gain inclusive fitness. The study clarified why males cooperate despite intense competition for matings and helped explain the evolutionary logic of lion sociality. It also framed the trade-off between sharing reproduction within a coalition and the collective benefit of holding a territory, a tension that recurs across social carnivores and that still guides interpretation of lion mating systems for field observers.