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Overnight changes in the temporal pattern of the crow. y-axis: duration (ms). (a) S1: duration of the first syllable, p=0.08; (b) S3: duration of the third syllable (final trill), p=0.08; (c) T13: interval between the beginning of the crow and the beginning of the final trill, p=0.036; (d) TD: total duration, p=0.005. p values: results of the Wilcoxon matched-pair test.
