Breeding of the rook (Corvus frugilegus L 1758) in Osijek during 2021

Vrana gačac (Corvus frugilegus L. 1758) redovita je gnjezdarica urbanih područja u hrvatskoj ornitofauni. Cilj završnog rada je utvrditi lokalitete i broj gnijezdećih parova vrane gačac (Corvus frugilegus L. 1758) na području grada Osijeka tijekom proljeća 2021. godine. Tijekom proljeća na području grada Osijeka gnijezdilo se 511 parova i to: jednoj velikoj, dvije srednje i 11 malih kolonija, koje su najčešće gradili na visokim stablima platana (Platana sp.).Rook (Corvus frugilegus L. 1758) is a resident nesting bird of urban areas in Croatia. The aim of this thesis is to research the roosting and nesting of the rook population, as well as its locations, during spring of 2021. In Osijek during spring of 2021 there were 511 couples distributed in 1 major, 2 middle and 11 minor colonies. Their typical nesting tree were high trees, most notably planes (Platanus sp.)