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Immature/adolescent, N = 6, N calls = 149; Nulliparous female, n = 2, N calls = 104; Parous female, N = 7, N calls = 75; Unflanged male, N = 2, N calls = 49; Flanged male, N = 4, N calls = 337. Error bars: +2 s.e. *** p = 0.001.
