Abstract
Abstract A historical survey was compiled of Rook (Corvus frugilegus) rookeries in the Moravian- Silesian region based on literature and private data covering period 1945-2015. Altogether, eighteen rookeries have been documented. During the second half of the 20 century the numbers of the Rook population in the Czech Silesia increased slowly from zero to ca. 500 breeding pairs, but the number of rookeries has decreased at the latest after 1990. Since 2000, probably only two local Rook's breeding sites exist in the town of Opava and Ostrava and only Rook's population inhabits Opava seem to be stable. It cannot be excluded that the extinction of the Silesian rookeries in the 1990s is a temporary phenomenon, whose consequence will be a further increase in the mean rookery size in town of Opava.
Highlights
The Rook is passerine found in the Palearctic region
Since 2000, probably only two local Rook's breeding sites exist in the town of Opava and Ostrava and only Rook's population inhabits Opava seem to be stable
In Central Europe, a large proportion of breeding sites is situated in agricultural landscapes as well as in urbanized areas (Orłowski & Czapulak 2007; Lemberk 2011)
Summary
It breeds from South Scandinavia to North Spain and across Eurasia to river Yenisei (Del Hoyo et al 2009). It ranks among the strongly colonial social birds, forming rookeries of a few pairs up to thousands of pairs in stands of tall mature trees (Del Hoyo et al 2009; Šťastný & Hudec 2011). In Central Europe, a large proportion of breeding sites is situated in agricultural landscapes as well as in urbanized areas (Orłowski & Czapulak 2007; Lemberk 2011). The Rook is unfrequently breeding bird species in the Czech Republic. Majority of Czech Rook's population breeding in catchment area of river Elbe and Vltava (Šťastný et al 2006; Šťastný & Hudec 2011). Rooks have nested regularly in just one rookery in the Moravia situated in Znojmo district (Balát & Hudec 1961, Klejdus 2013)
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