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The choices of pied flycatcher females in the four study areas (a) Daugavpils 2009; (b) Jyväskylä 2007; (c) Jyväskylä 2008 and (d) Oulu 2008. White bars denote number of pied flycatcher nests in the nestboxes with a symbol matching the symbol on the tit tutor's nest-box, black bars denote nests in the nestboxes with an opposite symbol. X-axis shows the number of offspring in the tit tutor nest on the day when presence of nest material indicated flycatcher choice.
