Search for: [Abstract = "In 2012\-2015 nests of the Rook \"Corvus frugilegus\" were counted in the Mazovian Lowland area \(42,379 km2\). A total of 69,442 nests on 693 sites were found. The overall population was estimated at 72,125\-76,488 nests. The average rookery size reached 100.2 nests \(SD = 192.4\). There were five colonies \(0.7%\) with at least 1,000 nests, 368 \(52.4%\) small colonies with up to 25 nests, 32 \(4.6%\) sites with single nests and 103 \(14.9%\) with up to 3 nests. 83% of all nests were located in rookeries with more than 100 nests \(26% of all colonies\)."]

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