Of the published ocular examination reports in various bird species, the dazzle reflex (light source unspecified) has been identified as present in eastern screech owls (Megascops asio), (5) Eurasian black vultures (Aegvpius monachus), (7) and griffon vultures (Gyps fulvus) (7); however, the assessment of a dazzle reflex is sporadically reported in other avian species.
Other studies have reported the prevalence of cataract in raptor species to range from 4% to 44% in eastern screech owls, (5) tawny owls (Strix aluco), (3,11) barred owls (Strix varia), (14) Cooper's hawks (Accipter cooper-ii), (14) great horned owls (Bubo virginianus), (14) and red-tailed hawks (Buteo jamaicensis).
Experimental West Nile virus infection in Eastern screech owls
The newest patient - another Eastern screech owl
known as 2030 - was brought in yesterday morning after a man in Southboro found it stuck in his car's grill, perhaps there overnight.
If immunity to WNV in this case was acquired, one could expect that northern owl species that spent years at the Owl Foundation would be just as resistant as the locally breeding Eastern Screech Owls
evisceration, enucleation, birds of prey, ocular trauma, avian, eastern screech owl, Megascops asio, great horned owl, Bubo virginianus, barred owl, Strix varia, red-tailed hawk, Buteo jamaicensis, bald eagle, Haliaeetus leucocephalus
Eviscerations were performed in 19 birds: 5 captive birds of prey of 4 different species (1 eastern screech owl [Megascops asio], 1 great horned owl [Bubo virginianus], 2 red-tailed hawks [Buteo jamaicensis], and 1 bald eagle [Haliaeetus leucocephalus]), and 14 free-living owls of 3 different species (1 great horned owl, 4 barred owls [Strix varia], and 9 eastern screech owls).
Hematologic values were compiled from 71 red-tailed hawks (Buteo jamaicensis), 54 Eastern screech owls
(Megascops asio), 31 Cooper's hawks (Accipiter cooperii), 30 great-horned owls (Bubo virginianus), 28 barred owls (Strix varia), 16 bald eagles (Haliaeetus leucocephalus), and 12 broad-winged hawks (Buteo platypterus).
Forty minutes later, IOP in the affected eye had been reduced by 10 mm Hg (approximately 27%) but it was still 11 mm Hg higher than the upper value of the reference interval for normal eastern screech owls
, (2,3) and 14 mm Hg higher than that in the opposite eye of this bird.
Eastern Screech Owls
in suburbia: a model of raptor urbanization.
15) In Eastern screech owls
(Megascops asio), the TonoVet gave higher values than the Tono-Pen on the d setting (for dogs and cats), whereas on the p setting (for other species), TonoVet values were lower than those obtained with the Tono-Pen.
Also, 1,418 ring-billed gulls; 102 herring gulls; one Iceland gull; 21 great black-backed gulls; 295 rock doves (pigeons); 236 mourning doves; 12 eastern screech owls
, a new high; 11 great horned owls; two barred owls; one northern saw-whet owl; five belted kingfishers; 38 red-bellied woodpeckers, a record; one yellow-bellied sapsucker; 188 downy woodpeckers, a new high; 38 hairy woodpeckers, a new mark; nine northern flickers; five pileated woodpeckers, equaling the record; 792 blue jays; 1,192 American crows, and two common ravens.
As Gehlbach mentions himself (page 198): "I have learned much and perhaps even more from Eastern Screech Owls
[Megascops asio]; but long-term events like population cycles need more time.
This study investigated AR exposure and toxicosis in four species of birds of prey (red-tailed hawks [Buteo jamaicensis], barred owls [Strix varia], eastern screech owls
[Megascops asio] and great horned owls [Bubo virginianus]) presented to a wildlife clinic in Massachusetts.
Eastern screech owls
(EASOs) were experimentally infected with the pathogenic New York 1999 strain of West Nile virus (WNV) by subcutaneous injection or per os.