Citation: Ga. Sonerud, HAWK OWLS IN FENNOSCANDIA - POPULATION FLUCTUATIONS, EFFECTS OF MODERN FORESTRY, AND RECOMMENDATIONS ON IMPROVING FORAGING HABITATS, The Journal of raptor research, 31(2), 1997, pp. 167-174
Citation: Bv. Jacobsen et Ga. Sonerud, SYNCHRONOUS SWITCH IN DIET AND HUNTING HABITAT AS A RESPONSE TO DISAPPEARANCE OF SNOW COVER IN TENGMALMS OWL AEGOLIUS-FUNEREUS, Ornis Fennica, 70(2), 1993, pp. 78-88