Attributes / relations provided by
♦ 1SUMMER DIET OF TWO SYMPATRIC SPECIES OF RAPTORS
UPLAND BUZZARD (BUTEO HEMILASIUS) AND EURASIAN EAGLE OWL (BUBO BUBO) IN ALPINE MEADOW: PROBLEM OF COEXISTENCE, Qinghu CUI, Jianping SU, Zhigang JIANG, POLISH JOURNAL OF ECOLOGY, Vol 56, 1 pp. 173179 (2008)
♦ 2Nestling diet and parental provisioning behaviour in the Marsh harrier (Circus aeruginosus), Marcin BRZEZIŃSKI, Michał ŻMIHORSKI, Acta Zoologica Lituanica, 2009, Volumen 19, Numerus 2