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Po wzroście liczebności w połowie XX wieku potem w południowo-zachodniej Polsce polne ptaki krukowate Corvidae (w przeciwieństwie do miejskich) silnie zmniejszyły swoje populacje. W niniejszej pracy porównano nieliczne konkretne dawne dane ze stanem obecnym. Liczebność wrony siwej Corvus cornix na trzech dolnośląskich powierzchniach próbnych badanych w latach 1960. lub 1970. oraz ostatnio (2008–2009)...
In the winter season of 2005/2006, birds wintering in the agricultural landscape of the Radomska Lowland , central Poland were counted on an area of 250 ha. The area was almost without trees, except for several pear-trees growing on balks. The central part was crossed by a drainage ditch. In total, 1104 individuals of 23 species were recorded. The most abundant species were represented by yellowhammer,...
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