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Do helpers really help? Provisioning biomass and prey type effects on nestling growth in the cooperative bell minerThe extended Moran effect and large-scale synchronous fluctuations in the size of great tit and blue tit populationsHelping effort increases with relatedness in bell miners, but 'unrelated' helpers of both sexes still provide substantial careIntraspecific nest parasitism and nest guarding in the Pied Flycatcher Ficedula hypoleucaClimate change, breeding date and nestling diet: how temperature differentially affects seasonal changes in pied flycatcher diet depending on habitat variationQuality vs. quantity: energetic and nutritional trade-offs in parental provisioning strategiesLarge-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 dateBegging signals more than just short-term need: cryptic effects of brood size in the pied flycatcher (Ficedula hypoleuca)Forms of density regulation and (quasi-) stationary distributions of population sizes in birds