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Individuals of many animal species show consistent differences in ecologically relevant behaviours, and these individual-specific behaviours can correlate with each other. In passerines, aggression during nest-site defence is one of those behaviours that have been steadily found to be repeatable within individuals. Furthermore, in several cases, aggression was related to some estimates of reproductive...
Although behavioural plasticity should be an advantage in a varying world, there is increasing evidence for widespread stable individual differences in the behaviour of animals: that is, ‘personality’. Here we provide evidence suggesting that sexual selection is an important factor in the evolution of personality in species with biparental care. We carried out a cross-fostering breeding experiment...
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