This study focused on analysing the diet composition of nestlings of different age during two breeding seasons in rural environment of agricultural farm near Veselí nad Lužnicí, South Bohemia. Feeding behaviour and habitat selection by parents was also monitored. Population decline of the species as a consequence of low invertebrates rate in nestlings diet and disappearing of important habitats are discussed. Most of studies on feeding behaviour in the Czech Republic focused only on feeding frequency. Two commonly used methods for diet determination, neck- collars and faecal analysis, were compared. The feeding frequency of male and female were also determined. Coleoptera (Scarebeidae) were the most often determined group in samples of feacals, while Diptera (Tipulidae) were the most often determined group in samples from ligatures. The differences between diet of younger and older nestling were assessed. While diet of young nestlings contained Diptera, Coleoptera dominated in diet of older nestlings. The vegetable food, mainly seeds of Poaceae, dominated in diet of older nestlings. Amount of food increased along age gradient (samples of older nestlings were heavier). Different effect of animal proportion in the nestling diet was determined. Increase in animal proportion in the dietof young nestlings caused...

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