“…Many hosts have evolved strategies to reduce the costs of parasitism Takasu et al, 1998;Schulze-Hagen et al, 2009). One of the most prevalent adaptations against brood parasitism is egg rejection, showing individual , sex-related (Palomino et al, 1998;Soler et al, 2002;Honza et al, 2007b;Pozgayová et al, 2009), population (Lindholm, 1999;Stokke et al, 2007a) and species-specific variability Davies and Brooke, 1989;Moksnes et al, 1991;Røskaft et al, 2002;Servedio and Hauber, 2006). Eggshell characteristics (e.g.…”