Northern Shrike (Lanius excubitor) Science Article 2
The aim of the study was to present variability in nest and breeding parameters of the Great Grey Shrike in Poland. We analyzed 83 nest record cards. Most data were recorded in 1982-2002. The analyzed parameters included: nest location, nest height, nest structure, breeding phenology, clutch size, breeding success and breeding losses. Our results were consistent with those found in the literature. In the paper we also discussed the possibilities and limitations of using data available in the Polish Nest Record Scheme.
Paulina Olborska and Jakub Z. Kosicki, BIOLOGICAL LETT. 2004, 41(2): 147n154