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Aromatic plants in blue tit Cyanistes caeruleus nests: no negative effect on blood-sucking Protocalliphora blow fly larvaeEctoparasite infestation and sex-biased local recruitment of hostsClutch-size variation in Western Palaearctic secondary hole-nesting passerine birds in relation to nest box designOffspring sex ratio is related to male body size in the great tit (Parus major)Brominated flame retardants and organochlorines in the European environment using great tit eggs as a biomonitoring tool