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Baboon grunts as cues to imminent group departure. Average grunt rate per individual and minute recorded at the sleeping site of baboons at Tsaobis (Namibia) before departure (D). The arrow indicates a significant increase in call rate (determined by means of a change-point analysis) about 5 min before the first individual’s leaving. (Data were kindly made available by Kristine Meise, Christina Keller, and Guy Cowlishaw).
