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Bubo virginianus (Great Horned Owl)

Citation:

Comparing the diet of Great Horned Owls (Bubo virginianus) in rural and urban areas of southwestern British Columbia.

Author(s)
Hindmarch, S. and Elliott, J.E.
Issue
4
Volume
128
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Location Sample Size Type
Dietary Composition Townsend vole: 84.8, common muskrat: 1.0, rat species: 1.0, medium songbirds: 5.1, family anatidae: 5.1, order coleoptera: 3.0 Percent by number in pellets/prey remains % NR Alaskan National Wildlife Area See citation Exposure Factor Datasets
Dietary Composition Townsend vole: 69.0, North American deer mouse: 11.2, rat species: 7.8, house mouse: 0.9, shrew-mole: 1.7, shrew species: 7.8, small songbirds: 0.9, American crow: 0.9 Percent by number in pellets/prey remains % NR Forest Richmond See citation Exposure Factor Datasets
Dietary Composition Townsend vole: 97.5, rat species: 2.5 Percent by number in pellets/prey remains % NR Arthur Drive See citation Exposure Factor Datasets
Dietary Composition Townsend vole: 70.3, North American deer mouse: 1.4, rat species: 1.4, shrew species: 9.5, American crow: 2.7, great blue heron: 1.4, barn owl: 10.8, order coleoptera: 2.7 Percent by number in pellets/prey remains % NR Terra Nova Park See citation Exposure Factor Datasets
Dietary Composition Townsend vole: 37.3, rat species: 25.5, eastern cottontail: 23.5, coast mole: 5.9, medium songbirds: 2.0, small songbirds: 2.0, American crow: 2.0, family anatidae: 2.0 Percent by number in pellets/prey remains % NR Beach Groove Park See citation Exposure Factor Datasets
Dietary Composition Townsend vole: 2.1, North American deer mouse: 21.3, rat species: 42.6, order lagomorpha: 2.1, eastern cottontail: 4.3, medium songbirds: 10.6, small songbirds: 6.4, American crow: 4.3, order coleoptera: 6.4 Percent by number in pellets/prey remains % NR Crescent Park See citation Exposure Factor Datasets
Dietary Composition Townsend vole: 57.3, pacific jumping mouse: 1.3, rat species: 33.4, eastern cottontail: 2.7, medium songbirds: 1.3, American crow: 1.3, family anatidae: 1.3, order coleoptera: 1.3 Percent by number in pellets/prey remains % NR Central Surrey Exposure Factor Datasets
Citation:

Effects of habitat disturbance on diets of Great Horned Owl (Bubo virginianus) in a cold desert.

Author(s)
Kremer, S.R. and Belk, M.C.
Issue
1
Volume
63
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Location Sample Size Type
Dietary Composition Mammalia: 89.76, aves: 7.07 Percent biomass in disturbed site % B Not Reported US Army Dugway Proving Ground 1478 Exposure Factor Datasets
Dietary Composition Mammalia: 95.74, aves: 0.85 Percent biomass in undisturbed site % B Not Reported US Army Dugway Proving Ground 2448 Exposure Factor Datasets
Citation:

Risk assessment methodologies for exposure of great horned owls (Bubo virginianus) to PCBs on the Kalamazoo River, Michigan.

Author(s)
Strause, K.D., Zwiernik, M.J., Newsted, J.L., Neigh, A.M., Millsap, S.D., Park, C.S., Moseley, P.P., Kay, D.P., Bradley, P.W., Jones, P.D. and Blankenship, A.L.
Issue
1
Volume
4
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Location Sample Size Type
Dietary Composition Class aves: 13.8, class mammalia: 86.2, class crustacae: 0.0 Percent biomass % NR Not Reported Fort Cluster 285 Exposure Factor Datasets
Dietary Composition Class aves: 24.8, class mammalia: 75.2, class crustacae: 0.0 Percent biomass % NR Not Reported Trowbridge 285 Exposure Factor Datasets
Citation:

Food habits of Great Horned Owls (Bubo virginianus) in the breeding season in Lami Biological Reserve, southern Brazil.

Author(s)
Tomazzoni, A.C., Pedó, E. and Hartz, S.M.
Volume
15
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Location Sample Size Type
Dietary Composition Mammals: 34, birds: 38, amphibians: 8, reptiles: 2, fishes: <1, insects: 18 Percent frequency % NR Not Reported Lami Biological Reserve 85 Exposure Factor Datasets

Bubo virginianus

Citation:

Factors influencing respiratory rates in four species of raptors

Author(s)
Daniels, Kathleen and G.E. Duke
Pages
703-706
Year
Volume
66
Exposure Endpoint Type Endpoint Value Endpoint Description Error Units Sex Life Cycle Stage Sample Size Type
Inhalation Rate 19.1 mean resting respiratory rate 3.28 SD #/min Not Reported Adult 4 Exposure Factor Datasets
Citation:

Metabolic rates of red-tailed hawks and great horned owls

Author(s)
Pakpahan, Ani M., Jonathon B. Haufler and Harold H. Prince
Pages
1000-1002
Year
Volume
91
Exposure Endpoint Type Endpoint Value Endpoint Description Error Units Sex Life Cycle Stage Sample Size Type
Metabolic Rate 0.343 mean standard metabolic rate 0.044 ml O^2/g bw/hr Female Adult 2 birds Exposure Factor Datasets
Metabolic Rate 0.566 mean standard metabolic rate 0.080 ml o^2/g bw/hr Male Adult 4 birds Exposure Factor Datasets
Body Weight - Mean 1,588 mean body weight 147 g Female Adult 2 birds Exposure Factor Datasets
Body Weight - Mean 1,229 mean body weight 106 g Male Adult 4 birds Exposure Factor Datasets
Citation:

Metabolic rate and evaporative water loss of Mexican spotted and great horned owls

Author(s)
Ganey, Joseph L., Russell P. Balda, and Rudy M. King
Pages
645-656
Year
Issue
4
Volume
105
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Type
Metabolic Rate 0.59 average basal metabolic rate cc O^2/g bw/hr Not Reported Adult 3 birds Exposure Factor Datasets
Citation:

North America's oldest great horned owl

Author(s)
Houston, C. Stuart
Pages
88-90
Year
Issue
2
Volume
50
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Location Sample Size Type
Longevity 20.7 known age at time of death yr Not Reported Adult s. of Aberdeen, Saskatchewan 1 bird Exposure Factor Datasets
Citation:

New great horned owl longevity record

Author(s)
Nero, Robert W.
Pages
91-92
Year
Issue
2
Volume
50
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Location Sample Size Type
Longevity 28+ age at time of death yr Female Adult Asiniboine Park Zoo, Winnipeg 1 bird Exposure Factor Datasets
Citation:

Ecology of a cottontail rabbit (Sylvilagus auduboni) population in central California

Author(s)
Fitch, Henry S.
Pages
159 - 184
Year
Volume
33
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Location Sample Size Type
Population Density 1 estimated population density based on call counts bird/100 acres Not Reported Adult San Joaquin Experimental Range 7 counts Exposure Factor Datasets
Citation:

Food consumption and energy, water, and nitrogen budgets in captive great-horned owls (Bubo virginianus)

Author(s)
Duke, G.E., J.G. Ciganek and O.A. Evanson
Pages
283-292
Year
Volume
44
Exposure Endpoint Type Endpoint Value Endpoint Description Error Units Sex Life Cycle Stage Sample Size Type
Food Ingestion Rate 26.58 daily food intake on a mouse diet, dry weight basis 4.08 g/kg/d Not Reported Adult 4 owls x 5 days = 20 owl days Exposure Factor Datasets
Food Ingestion Rate 26.37 daily food intake on a turkey poult diet, dry weight basis 6.33 SD g/kg/d Not Reported Adult 26 owl days Exposure Factor Datasets
Body Weight - Mean 1615 mean of averaged body weights (10-13 weighings/bird) g Not Reported Adult 4 birds Exposure Factor Datasets
Citation:

Arthropod diet of a western horned owl

Author(s)
Ohlendorf, Harry M.
Pages
124-125
Year
Issue
1
Volume
16
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Dietary Composition wolf spider (1), centipede (2), tarantula (3), grasshopper (1), walking stick (2) numbers of prey items in stomach contents Not Reported Adult 13 mi NE Fort Davis, Jeff Davis County 1 owl Exposure Factor Datasets
Citation:

Diet, cast composition, and energy and nutrient intake of red-tailed hawks (Buteo jamaicensis), great horned owls (Bubo virginianus), and turkey vultures (Cathartes aura)

Author(s)
Tabaka, Christopher S., Duane E. Ullrey, James G. Sikarskie, Sharon R. DeBar and Pao K. Ku
Pages
187-196
Year
Issue
2
Volume
27
Exposure Endpoint Type Endpoint Value Endpoint Description Error Units Sex Life Cycle Stage Sample Size Type
Food Ingestion Rate 115 weight consumed per day on an all chick diet 16.9 SD g/d Not Reported Adult 4 owls Exposure Factor Datasets
Food Ingestion Rate 114 weight consumed per day on an all hamster diet 21.4 SD g/d Not Reported Adult 4 owls Exposure Factor Datasets
Citation:

Reversed sexual size dimorphism: its effect on prey selection by the great horned owl, Bubo virginianus

Author(s)
Longland, William S.
Pages
395-398
Year
Issue
3
Volume
54
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Dietary Composition Dipodomys ordii (0.13%), Microtus montanus (0.14%), Perognathus parvus (0.02%), Peromyscus maniculatus (0.50%), Thomomys umbrinus (0.21%) relative proportion of prey species in the diet, based on pellet analysis Female Adult Gund Research Ranch, University of Nevada 1 owl Exposure Factor Datasets
Dietary Composition Dipodomys ordii (0.11%), Microtus montanus (0.12%), Perognathus parvus (0.03%), Peromyscus maniculatus (0.63%), Thomomys umbrinus (0.10%) relative proportion of prey species in the diet, based on pellet analysis Male Adult Gund Research Ranch, University of Nevada 1 owl Exposure Factor Datasets
Citation:

Food habits of the great horned owl (Bubo virginianus) in the cape region of Lower California, Mexico

Author(s)
Llinas-Gutierrez, Jorge, Gustavo Arnaud and Marcos Acevedo
Pages
140-141
Year
Issue
4
Volume
25
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Dietary Composition mammals (47.0%), birds (5.2%), reptiles (15.7%), arachnids (8.7%), centipedes (7.0%), insects (16.5%) percent of total numbers of prey items in diet, based on pellet analysis Both Male and Female Adult El Comitan, Baja California Sur 2 owls (49 pellets) Exposure Factor Datasets
Citation:

Food consumption and pellet formation rates in four owl species

Author(s)
Marti, Carl D.
Pages
178-181
Year
Issue
2
Volume
85
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Location Sample Size Type
Food Ingestion Rate 62.6 average daily consumption on an all mouse diet g/d Not Reported Adult collected in Larimer County, CO 1 owl Exposure Factor Datasets
Citation:

Great horned owl food habits at Mono Lake, California

Author(s)
Aigner, Paul A., Michael L. Morrison, Linnea S. Hall, and William M. Block
Pages
286-288
Year
Issue
3
Volume
39
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Dietary Composition Sylvilagus spp. (1.0%), unident. lagomorphs (0.2%), Peromyscus maniculatus (42.%), Microtus monatus (23.7%), unident. rodents (2.9%), Myotis spp. (1.9%), unident. mammal (1.5%), Podiceps nigricollis (1.0%), unident. rail (0.2%), Larus californicus (1.7%), unident. owl (0.4%), unident. blackbird (0.4%), unident. large bird (4.6%), unident. medium bird (1.2%), unident. small bird (6.9%), unident. vertebrate (1.0%), insects (8.3%), scorpions (0.4%) percent occurence of prey items in pellets Not Reported Not Reported Paoha Island, Mono Lake 219 pellets, 518 remains Exposure Factor Datasets
Dietary Composition Lepus californicus (0.2%), Sylvilagus spp. (6.0%), unident. lagomorphs (1.7%), Peromyscus maniculatus (69.2%), Microtus monatus (0.7%), Dipodomys spp. (0.6%), unident. rodents (0.4%), Myotis spp. (1.1%), unident. chiropteran (0.2%), unident. mammal (3.9%), Larus californicus (1.3%), unident. large bird (7.1%), unident. medium bird (1.1%), unident. small bird (0.9%), unident. vertebrate (4.3%), insects (1.5%) percent occurence of prey items in pellets Not Reported Not Reported Negit Island, Mono Lake 188 pellets, 536 remains Exposure Factor Datasets
Citation:

Predation ecology of coexisting great horned and barn owls

Author(s)
Rudolph, Seri G.
Pages
134-137
Year
Issue
1
Volume
90
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Dietary Composition Microtus (66.7%), Peromyscus (27.6%), Dipodomys (1.1%), Sylvilagus (0.3%), Euphagus cyanocephalus (0.3%), Sorex (0.2%), Tadarida brasiliensis (0.2%), Mustela frenata (0.2%), unident. bird (1.4%), unident. small mammal (0.7%), insect (1.3%) percent occurence of prey items in pellets Not Reported Not Reported Tule Lake National Wildlife Refuge 107 pellets Exposure Factor Datasets
Citation:

Food-niche relationships between great horned owls and common barn owls in eastern Washington

Author(s)
Knight, Richard L. and Ronald E. Jackman
Pages
175-179
Year
Volume
101
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Dietary Composition Sylvilagus nuttallii (12.4%), Spermophilus washingtoni (0.4%), Thomomys talpoides (29.7%), Perognathus parvus (12.5%), Dipodomys ordii (1.4%), Reithrodontomys megalotis (0.3%), Peromyscus maniculatus (6.2%), Neotoma cinerea (2.1%), Microtus montanus (7.7%), Mus musculus (0.2%), unident. microtinae (4.5%), Mustela frenata (0.4%), Anas platyrynchos (2.6%), Phasianus colchicus (2.5%), Fulica americana (1.5%), Charadrius vociferus (0.2%), Tyto alba (10.7%), Sternella neglecta (0.2%), unident. Fringillidae (0.2%), unident. Passeriformes (1.2%), unident. snake (1.4%), Cyprinus carpio (1.3%), Stenopelmatus spp (0.2%) percent of total prey biomass Not Reported Not Reported Esquatzel Coulee, Franklin County 234 pellets Exposure Factor Datasets
Citation:

Diet and trophic characteristics of great horned owls in southwestern Idaho

Author(s)
Marti, Carl D. and Michael N. Kochert
Pages
499-506
Year
Issue
4
Volume
67
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Dietary Composition unident. snake (0.3%), Sylvilagus nuttallii (19.2%), Lepus californicus (14.3%), unident. leporid (16.1%), Spermophilus townsendii (0.6%), Thomomys townsendii (14.6%), Perognathus parvus (0.4%), Dipodomys ordii (11.1%), Reithrodontomys megalotis (0.2%), Peromyscus spp (2.3%), Neotoma cinerea (4.6%), Neotoma lepida (2.0%), unident. woodrat (0.3%), Microtus montanus (4.7%), Mus musculus (0.7%), Mustela frenata (0.1%), Falco sparverius (0.1%), Phasianus colchicus (1.9%), Callipepla californicus (0.1%), unident. galliform (0.4%), Fulica americana (0.4%), Columba livia (0.9%), Tyto alba (0.3%), Sturnus vulgaris (0.2%), unident. passerine (0.6%), unident. bid (3.4%) occurence in diet as percent of total prey biomass, based on pellet analysis Not Reported Not Reported Snake River Birds of Prey National Conservation Area (42 deg, 50'N, 115 deg, 50'W) 14 nesting areas, 1472 prey items Exposure Factor Datasets
Citation:

The growth of some young raptorial birds

Author(s)
Sumner, E. Lowell, Jr.
Pages
277-308
Year
Issue
4
Volume
40
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Growth Rate see figures figures showing weight increase and feather growth for 0-73 days of age Not Reported Nestling collected in California five owls Exposure Factor Datasets
Citation:

Growth analysis of a female great horned owl in central Ohio

Author(s)
Springer, Mark A.
Pages
218-221
Year
Issue
6
Volume
50
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Location Sample Size Type
Growth Rate 0.1900 growth constant based on logistic growth equation Female Nestling Delaware County 1 owl Exposure Factor Datasets
Citation:

Notes on nesting great horned owls in southern Arizona

Author(s)
Mader, William J.
Pages
109-111
Year
Issue
3/4
Volume
7
Exposure Endpoint Type Endpoint Value Endpoint Description Range Units Sex Life Cycle Stage Location Sample Size Type
Time of Mating/ Laying February (peak), March (end) egg laying dates Female Adult Pima and Pinal Counties 16 nests Exposure Factor Datasets
Clutch or Litter Size 2.5 mean clutch size 2-4 eggs/clutch Female Adult Pima and Pinal Counties 16 nests Exposure Factor Datasets
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