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Nest defence and offspring provisioning in a cooperative bird: individual subordinates vary in total contribution, but no division of tasks among breeders and subordinates

BiologyAnimal BehaviourBreeding BehaviorBehavioral SciencesTotal ContributionFitnessNatural SciencesEvolutionary BiologyInterspecific Behavioral InteractionCooperative BirdAvian EvolutionAnimal BehaviorNest Defence