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Age of male is an important cue in mate selection, including extra-pair copulations; different phenotypic andbehavioural traits are known to be age related. Paternity studies show that older males predominate as fathersof extra-pair young. It remains unclear if females actively choose older males because they possess high qualitytraits or because older males are more successful in coercing fertile females. We experimentally providedmounted males of different age (yearling vs. adult) of great grey shrike Lanius excubitor with nuptial gifts ofdifferent quality (vole vs. cricket) and observed reactions of females and their social partners. Females stronglypreferred older males with energy-rich nuptial gifts. The reactions of females’ social partner to the extra-pairmale did not differ significantly amongst experimental groups. However, males responded to the reaction of theirmates and male aggressive behaviour increased when their mate showed an interest in an intruder

Females prefer extra-pair males that are older and better hunters