Figure 1

Effect of warning calls of Siberian jay breeders on the reaction time of non-breeders during simulated goshawk attacks. Non-breeders which received a warning call (Nā=ā23 experiments) escaped faster to nearby cover than non-breeders which were not warned (Nā=ā8 experiments). Data from two experiments were missing since the camera recording the whole set-up did not work properly.