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Mean serum cortisol concentrations (±s.e.) in ng ml−1 following playback of U. beldingi trill alarm call (n = 10 litters), whistle alarm call (n = 9), U. beldingi squeal (conspecific control vocalization; n = 10) and silent control (n = 10). Data from multiple juveniles in a litter were first averaged. See text for details.
