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Selection for fast and slow exploration affects baseline and stress-induced corticosterone excretion in Great tit nestlings, Parus majorGeographical variation in egg mass and egg content in a passerine birdDigit ratios have poor indicator value in a wild bird populationYolk hormones and sexual conflict over parental investment in the pied flycatcherCorticosterone metabolites in blue tit and pied flycatcher droppings: Effects of brood size, ectoparasites and temperature