Trophic ecology of the Great Horned Owl (Bubo virginianus
) has recently received considerable attention (Houston and others 1998; Johnsgrad 2002).
Presas de Bubo virginianus
en Canadon Las Coloradas, departamento Pilcaniyeu, provincia de Rio Negro.
To do this, we broadcast calls of a Great Horned Owl (Bubo virginianus
unicinctus) and Great Horned owl (Bubo virginianus
columbarius 0 0 Calipepla (Lophortyx) californica 11 24 Meleagris (Parapavo) californicus 136 112 Patagioenas (Columba) fasciata 1 1 Zenaidura macroura Rallus limicola Tringa melanoleuca Tyto alba (Aluco pratincola) 1 0 Strix brea Asio otus (wilsonianus) 0 5 Otus kennicotti (asio) 0 4 Bubo virginianus
20 27 Glaucidium gnoma 0 19 Phalenoptilus nuttalli Melanerpes formicivorus Melanerpes lewisi Colaptes auratis (cafer) 2 23 Sphyrapicus sp.
Of the 19 owl species on this continent, the great horned owl (Bubo virginianus
) is the largest and most powerful, and it therefore became the epitome of those perceptions.
It also gives biologists the opportunity to choose from the best possible release sites in parts of Texas based upon present land conditions, historical records, prey diversity and abundance, and the relative absence of aerial predators such as great horned owls (Bubo virginianus
Great horned owls (Bubo virginianus
) remained unprotected statewide until March 1972, when the United States and several foreign signatories ratified an amended Migratory Bird Treaty Act of 1918.
Individuals of three snake species, common kingsnake (Lampropeltis getula), timber rattlesnake (Crotalus horridus), and rat snake (Elaphe obsolete) consumed four cotton rats, and one great horned owl (Bubo virginianus
) preyed upon one of the 72 rats released.
nivalis found in a great horned owl (Bubo virginianus
) pellet collected in Wapello County, Iowa, represent a tenuous closer record (Scott, 1939).
Species Common name Aegolius funereus Tengmalm's Owl Strix uralensis Ural Owl Strix aluco Tawny Owl Bubo virginianus
Great Horned Owl Nyctea scandiaca Snowy Owl Buteo lagopus Rough-legged Buzzard Circus cyaneus Northern Harrier Accipiter gentilis Goshawk Falco tinnunculus Eurasian Kestral Alopex lagopus Arctic fox Species Literature citations Aegolius funereus Korpimaki (1987, 1989) Strix uralensis Pietiainen (1988), Pietiainen and Kolunen (1993) Strix aluco Southern (1970) Bubo virginianus
Houston and Francis (1995) Nyctea scandiaca Portenko (1972) Buteo lagopus Hagen (1969) Circus cyaneus Simmons et al.
gentilis), merlin (Falco columbarius), boreal owl (Aegolius funereus), great horned owl (Bubo virginianus
), and northern hawk-owl were broadcast during surveys.
(19) Further more, CoHV-1 was found to be responsible for fatal hepatosplenitis in different species of owls (20,21) (Nino.x connivens, Ninox strenua, and Bubo virginianus
) and an Australian hobby (Falco longipennis).
In North America, other raptor species have been found infected with H5N8 or H5N2 virus: Cooper's hawk (Accipiter cooperii), great horned owl (Bubo virginianus
), red-tailed hawk (Buteo jamaicensis), peregrine falcon (Falco peregrinus), and bald eagle (Haliaeetus leucocephalus).
Prey species diversity was relatively high among birds compared to mammals, with Chukar Partridge (Alectoris chukar), tetraonids, Great Horned Owls (Bubo virginianus
), and corvids most abundant.