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The concept of behavioural syndromes hypothesizes that consistent behaviours across various situations mediate important life… Expand Extrapair paternity may create marked variation in the reproductive success of males and thus contribute to the evolution of… Expand Many group-living animals approach and mob nest predators, since grouping can increase the effectiveness of defence against… Expand Field studies suggest that in autumn, passerine Siberian-African migrants make a detour around Central Asia. We tested whether it… Expand How important female choice is for the evolution of male secondary sexual characteristics is controversial. Two field and one… Expand Abstract In a study of the pied flycatcher the availability of nest sites, and hence the territory size of males, was manipulated… Expand Abstract The deception hypothesis has been proposed as an explanation for polygyny in the pied flycatcher. According to this… Expand Abstract The plumage colour of male pied flycatchers varies on a continuum from brownish and female-like to a conspicuous black… Expand Abstract Prey choice variation was studied in a multiple-prey loader, the pied flycatcher, Ficedula hypoleuca , by manipulating… Expand Breeding behaviour and spermatogenesis of all males in a population of pied flycatchers, Ficedula hypoleuca, were experimentally… Expand