Low but contrasting neutral genetic differentiation shaped by winter temperature in European great tits.Climate change, breeding date and nestling diet: how temperature differentially affects seasonal changes in pied flycatcher diet depending on habitat variationGeographical variation in egg mass and egg content in a passerine birdClutch-size variation in Western Palaearctic secondary hole-nesting passerine birds in relation to nest box designBrominated flame retardants and organochlorines in the European environment using great tit eggs as a biomonitoring toolThe design of artificial nestboxes for the study of secondary hole-nesting birds: A review of methodological inconsistencies and potential biasesGeographical trends in the yolk carotenoid composition of the pied flycatcher (Ficedula hypoleuca)