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DEAR EDITOR,rnThe call for help hypothesis proposes that alarm calls produced by a bird can transmit wing information to both conspecific and interspecific neighbors.Neighbors who are attracted by social transmission might benefit from knowing about the presence of danger or by gaining information about the presence of predators or brood parasites nearby.Brood parasite hosts can distinguish threats from different intruders and exhibit varied responses correspondingly.However, most previous studies have conducted sound playback at host nest sites and focused on conspecific individuals attracted by the alarm calls.In this study, we used random location playback to investigate the responses of different host species to alarm signals of oriental reed warblers (Acrocephalus orientalis) toward different intruders (brood parasite, predator, and harmless control) in order to reveal how hosts evaluate different threats from different intruders using vocal information in non-nesting areas during the breeding season.