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Relatedness to brood and helper provisioning. Relatedness had a significant effect on the rate at which immigrant and natal helpers fed young. Bars show means ± s.e. predicted by the model shown in electronic supplementary material, table S2, with other parameters set to their mean values. The number of individual-years in each category is shown at the base of each bar. Further sample sizes are given in electronic supplementary material, table S2.
