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To provide reliable information about individual-specific characteristics, sexual signals should be consistently displayed within an individual at least within a particular social context or time window. However, some male traits, like bird song, depict extreme within-individual variations even within a very short time frame. To investigate the extent by which acoustic displays in male collared flycatchers (Ficedula albicollis) reveal consistent individual-specific attributes or more flexible characteristics, we assessed the repeatability of various song traits at different sampling regimes (within-day, between-day, and between-year contexts). Repertoire size showed considerably high and significant repeatability (R > 0.25) in all temporal contexts suggesting that it can potentially indicate an individual attribute that is shaped by genetic background, permanent environmental effects, or long-term …