Hatchwell, Ben J.; Russell, Andrew F.; MacColl, Andrew D.C. - In: Behavioral Ecology 15 (2004) 1, pp. 1-10
Helpers at the nest in the cooperative breeding system of long-tailed tits Aegithalos caudatus exhibit kin preference in their helping behavior. The aim of this study was to use multivariate analyses to investigate whether helpers accrue indirect fitness benefits through their cooperation by...