Kasprzykowski Z, Ciesluk P. Rough-legged Buzzard Buteo lagopus wintering in central eastern Poland: population structure by age and sex, and the effect of weather conditions . Ornis Fenn [Internet]. 2011Jul.1 [cited 2024Nov.2];88(2):98–103. Available from: https://ornisfennica.journal.fi/article/view/133767