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Damages caused by insects on cork oak and holm oak: (a) leaves eaten by larvae of gypsy moth  

Damages caused by insects on cork oak and holm oak: (a) leaves eaten by larvae of gypsy moth  

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Contact calling is a ubiquitous behavior of group-living animals. Yet in birds, beyond a general connection with group cohesion, its precise function is not well-understood, nor is it clear what stimulates changes in contact call rate. In an aviary experiment, we asked whether Swinhoe's White-eyes, Zosterops simplex, would regulate their own produc...