Eurasian Eagle-Owl (Bubo bubo) Science Article 10 abstract Little quantitative information on the development and behaviour of chicks and young is available for many species, despite the crucial importance of such data and the sensitivity of this stage in a bird’s life. For Eagle Owls Bubo bubo, despite the large amount of scientific literature on […]

Eurasian Eagle-Owl (Bubo bubo) Science Article 11 abstract Monogamy appears to be the most commonmating system amongst raptors and owls. However,alternative breeding strategies have beendescribed (i.e. polygyny, polyandry and cooperativebreeding; Newton, 1979; Mikkola,1983; Del Hoyo et al., 1999; Hatchwell &Komdeur, 2000). Recent studies have shownthat co-operative breeding is much more widespreadthan had previously been thought; […]

Eurasian Eagle-Owl (Bubo bubo) Science Article 3 abstract We performed a playback experiment in order to assess the efficiency of two methods for detecting Eagle Owls Bubo bubo and to assess factors affecting detection rates. In each experimental visit we recorded the number and sex of the responding owls, the calling rate and the corresponding […]

Boreal Owl (aegolius funereus) Science Article 3 abstract Scent markings (urine and f ces) of small mammals are visible in ultraviolet (UV) light. Diurnal kestrels, Falco tinnunculus, use them as a cue to find areas of food abundance. We studied whether vole-eating, nocturnal Tengmalm’s owls, golius funereus, can see vole scent marks using UV-vision. In […]

Boreal Owl (aegolius funereus) Science Article 2 abstract Clutch size and breeding success was related to nest-box size in 215 nests of Tengmalm’s owl in the Kauhava region, western Finland in 1966-82, In vole peak years, but not in other years, mean clutch size was positively correlated with the bottom area of the nest-box, increasing […]

Boreal Owl (aegolius funereus) Science Article 4 abstract Nest predation and its avoidance are critical components of an individual’s fitness and play an important role in life history evolution. Almost all studies on this topic have been observational, and thus have not been able to separate the effects of individual quality, habitat selection and predation […]

Boreal Owl (aegolius funereus) Science Article 1 abstract Altogether 287 nests of Tengmalm s Owl golius funereus were visited in 1960-82 in westem Finland. The-clurches were si’nificantly larger in nest-boxes than in natural cavities. The hatching percentage and number of fledglings also seemed to be higher in boxes than in natural nesting places. But the […]

[order] STRIGIFORMES | [family] Strigidae | [latin] Megascops hoyi | [authority] Koenig and Straneck, 1989 | [UK] Yungas Screech Owl | [FR] Petit-duc de hoy | [DE] Hoyeule | [ES] Autillo fresco | [NL] Hoy Schreewuil Subspecies Genus Species subspecies Region Range Megascops hoyi SA s Bolivia to nw Argentina Genus The genus Megascops comprises […]

[order] STRIGIFORMES | [family] Strigidae | [latin] Otus silvicola | [authority] Wallace, 1864 | [UK] Wallaces Scops Owl | [FR] Petit duc des forets | [DE] Wallaceeule | [ES] Autillo de Wallace | [NL] Wallace’s Dwergooruil Subspecies Genus Species subspecies Region Range Otus silvicola AU Lesser Sundas Genus Members of the genus Otus are the […]

[order] STRIGIFORMES | [family] Strigidae | [latin] Megascops roboratus | [authority] Bangs and Noble, 1918 | [UK] West Peruvian Screech Owl | [FR] Petit duc du Perou | [DE] Buscheule | [ES] Autillo Peruano | [NL] Maranonschreeuwuil Subspecies Monotypic species Genus The genus Megascops comprises 22 living species are known at present, but new ones […]