Great Horned Owl (Bubo virginianus)

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Great Horned Owl (Bubo virginianus)

Citation:

Hawks, Owls and Wildlife

Author(s)
Craighead, John J. and Frank C. Craighead, Jr.
Pages
443
Publisher
Dover Publications, Inc.
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Dietary Composition white-footed mice (58.2%), meadow mice (28.0%), other small mammals (2.8%), medium sized mammals (5.1%), gamebirds and sm-med sized birds (4.8%), other birds (1.2%) percent occurrence of prey items in pellets Not Reported Not Reported 297 pellets from 14 owls Superior township Exposure Factor Datasets
Time of Nesting Mar 12 - Jun 4 period from earliest egg laying date to date of latest brood departure Both Male and Female Adult 4 nests Jackson Hole Exposure Factor Datasets
Time of Hatching or Parturition Apr 14 earliest hatching date Not Reported Nestling 4 nests Jackson Hole Exposure Factor Datasets
Population Density 1 density of nesting pairs pair/3 mi^2 Both Male and Female Adult 4 nests Jackson Hole Exposure Factor Datasets
Citation:

Predation by owls in the Sierran foothills of California

Author(s)
Fitch, Henry S.
Pages
137-151
Year
Volume
49
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type California Counties
Dietary Composition cottontail (61.1%), woodrat (17.9%), kangaroo rat (4.5%), pocket gopher (4.3%), gopher snake (3.7%), ground squirrel (2.4%), other spp (birds, reptiles, amphibians, invertebrates; 6.1%) percent occurrence by weight in pellets Not Reported Not Reported 654 pellets, 1471 prey items San Joaquin Experimental Range Exposure Factor Datasets Madera
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 Units Sex Life Cycle Stage Sample Size Location Type Lab
Body Weight - Mean 1615 mean of averaged body weights (10-13 weighings/bird) g Not Reported Adult 4 birds Exposure Factor Datasets Laboratory
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 Units Sex Life Cycle Stage Sample Size Location Type Condition
Clutch or Litter Size 2.5 mean clutch size eggs/clutch Female Adult 16 nests Pima and Pinal Counties Exposure Factor Datasets breeding
Fledging or Weaning Rate 1.1 rate of production of young at least 4 weeks old young/nest Not Reported Nestling 16 nests Pima and Pinal Counties Exposure Factor Datasets breeding
Fledging or Weaning Rate 9/16 fraction of nests that sucessfully raised at least one nestling to the age of 4 weeks successful nests/total nests Both Male and Female Adult 16 nests Pima and Pinal Counties Exposure Factor Datasets breeding
Citation:

Red-tailed hawk and horned owl populations in Wisconsin

Author(s)
Orians, Gordon and Frank Kuhlman
Pages
371-385
Year
Volume
58
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Population Density pairs/mi^2 Both Male and Female Adult 12-22 pairs (3 study years) southern Green County Exposure Factor Datasets
Time of Mating/ Laying Feb 5-15 peak period of egg laying Female Adult 11-17 nests (3 study years) southern Green County Exposure Factor Datasets
Fledging or Weaning Rate mean number of fledglings produced per successful nest fledglings/nest Not Reported Fledgling 11-17 nests (3 study years) southern Green County 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 Sample Size Location 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 1 owl 13 mi NE Fort Davis, Jeff Davis County 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 Units Sex Life Cycle Stage Sample Size Location Type Error Lab
Food Ingestion Rate 115 weight consumed per day on an all chick diet g/d Not Reported Adult 4 owls Exposure Factor Datasets 16.9 SD Laboratory
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