Solar activity affects avian timing of reproductionUltraviolet-blue reflectance of some nestling plumage patches mediates parental favouritism in great tits Parus majorLarge-scale geographical variation confirms that climate change causes birds to lay earlierPied Flycatchers Ficedula hypoleuca travelling from Africa to breed in Europe: differential effects of winter and migration conditions on breeding dateBrominated flame retardants and organochlorines in the European environment using great tit eggs as a biomonitoring toolPredator odour recognition and avoidance in a songbird