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American Kestrel (Falco sparverius)

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 Units Sex Life Cycle Stage Sample Size Location Type Condition Error Lab
Inhalation Rate 35.4 mean resting respiratory rate #/min Not Reported Adult 4 Exposure Factor Datasets crippled, non-releasable 3.21 SD Laboratory
Citation:

A population study of the sparrow hawk in east-central Illinois

Author(s)
Enderson, James Harris
Pages
222-231
Year
Issue
3
Volume
72
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Population Density 4 wintering population size individuals/43 sq mi Not Reported Not Reported Not Reported agricultural lands Exposure Factor Datasets
Population Density 0.58 breeding population density birds/mi2 Not Reported Not Reported 25 birds agricultural lands Exposure Factor Datasets
Home Range 1.5 mean maximum diameter of winter home ranges mi Not Reported Not Reported 3 birds agricultural lands Exposure Factor Datasets
Home Range 1.4 mean maximum diameter of breeding home ranges mi Not Reported Not Reported 4 birds agricultural lands Exposure Factor Datasets
Citation:

Respiratory metabolism of three species of raptors

Author(s)
Gatehouse, S.N. and B.J. Markham
Pages
738-741
Year
Volume
87
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Lab
Metabolic Rate combined day and night oxygen consumption over one 24 hr period ml oxygen/g/hr Both Male and Female Adult 3 birds Exposure Factor Datasets Laboratory
Citation:

Fat content of American kestrels and sharp-shinned hawks estimated by total body electrical conductivity

Author(s)
Gessaman, J.A. and S.M. Harden
Pages
56-57
Year
Issue
1
Volume
29
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Condition Error
Body Fat (total or %) 6.01 percent body fat calculated from total body electrical conductivity % Male Adult 12 Cape May Exposure Factor Datasets migrating 1.92 SE
Body Fat (total or %) 8.51 percent body fat calculated from total body electrical conductivity % Female Adult 13 Cape May Exposure Factor Datasets migrating 2.00 SE
Citation:

Premigratory fat in the American kestrel

Author(s)
Gessaman, James A.
Pages
625-626
Year
Issue
4
Volume
91
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Condition
Body Fat (total or %) mean percent body fat as measured by fat extraction from April to September % Male Adult 14 Cache county Exposure Factor Datasets premigratory
Citation:

An evaluation of heart rate as an indirect measure of daily energy metabolism of the American kestrel

Author(s)
Gessaman, James A.
Pages
273-289
Year
Volume
65
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error Lab
Metabolic Rate 23.06 daily energy metabolism based on heart rate (30 C) and a linear regression equation for heart rate and volume of oxygen consumed kcal/d Not Reported Adult 1 Exposure Factor Datasets 1.03 SE Laboratory
Citation:

Fat content of American kestrels and sharp-shinned hawks estimated by total body electrical conductivity

Author(s)
Harden, Shari M.
Pages
42
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error Lab
Body Fat (total or %) 2.46 total body fat based on Soxhlet fat extraction g Both Male and Female Adult 21 Exposure Factor Datasets 0.25 SE Laboratory
Citation:

Food habits and abundance of raptors in an agricultural area of Tulare County, California

Author(s)
Hawkins, Cole Carlson
Pages
102
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type California Counties
Dietary Composition insects (97%), isopod (5%), birds (27%), mammals (25%) percent occurrence in sample pellets Not Reported Not Reported Not Reported agricultural lands Exposure Factor Datasets Tulare
Citation:

Clutch sizes, hatchability rates, and sex ratios of sparrow hawks in eastern Pennsylvania

Author(s)
Heintzelman, Donald S. and Alexander C. Nagy
Pages
306-311
Year
Issue
3
Volume
80
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Duration of Incubation or Gestation 30.9 incubation period d Both Male and Female Embryo 2 clutches (8 eggs) Berks county Exposure Factor Datasets
Survival/ Mortality 78 hatching success % Both Male and Female Hatchling 55 eggs (14 clutches) Berks county Exposure Factor Datasets
Clutch or Litter Size 4.23 eggs Female Adult 13 clutches Berks county Exposure Factor Datasets
Citation:

An analysis of the population dynamics of selected avian species with special reference to changes during the modern pesticide era

Author(s)
Henny, Charles J.
Pages
23-28
Publisher
United States Department of the Interior, Fish and Wildlife Service, Wildlife Research Report No. 1
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Countries Error
Clutch or Litter Size 4.59 eggs/clutch Female Adult 244 Exposure Factor Datasets 0.60 SD
Survival/ Mortality 0.602 mortality rate estimate for banded individuals Both Male and Female Both Adults and Juveniles 118 throughout USA and Canada Exposure Factor Datasets 0.035 SD
Survival/ Mortality 0.465 mortality rate of banded individuals, 1946-65 Both Male and Female Adult 6,544 throughout USA and Canada Exposure Factor Datasets CANADA, USA 0.017 SD
Citation:

The incidence of man-caused and natural mortalities to raptors

Author(s)
Keran, Doug
Pages
108-112
Year
Issue
4
Volume
15
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Countries
Longevity 118 longest survival of a banded individual mo Both Male and Female Both Adults and Juveniles 1,017 records of mortality Exposure Factor Datasets USA
Survival/ Mortality 12.6 average length of survival of banded individuals mo Both Male and Female Both Adults and Juveniles 1,017 throughout USA Exposure Factor Datasets
Citation:

Differential habitat use by sexes of American kestrels wintering in northern California

Author(s)
Koplin, James R.
Pages
39-42
Year
Issue
2
Volume
7
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type California Counties Error
Population Density 34 average density kestrels/100 mi Both Male and Female Both Adults and Juveniles 135 obs. coastal and coast range areas Exposure Factor Datasets Colusa, Humboldt, Lake, Mendocino, Yolo +/- 11 95% CI
Citation:

Foraging strategies of American kestrels during breeding

Author(s)
Rudolph, Seri G.
Pages
1268-1276
Year
Volume
63
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type California Counties Condition
Population Density 23 individuals per 96 km2 Both Male and Female Adult 23 agricultural lands (lat, 38 deg 32'N; long., 121 deg 47'W) Exposure Factor Datasets Yolo Breeding
Foraging Distance distance foraged from nest km Female Adult 4 agricultural lands (lat, 38 deg 32'N; long., 121 deg 47'W) Exposure Factor Datasets Yolo Breeding
Citation:

The hunting behavior of American kestrels: Applications of foraging theory

Author(s)
Rudolph, Seri Gale
Pages
64
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type California Counties Condition
Dietary Composition mammal (57%), insect (42%), other (1%) percent composition of sample pellets (by volume) Both Male and Female Adult 59 pellets agricultural lands Exposure Factor Datasets Yolo breeding
Dietary Composition mammal (43%), insect (51%), other (6%) percent composition of sample pellets (by volume) Both Male and Female Adult 71 pellets agricultural lands Exposure Factor Datasets Yolo breeding
Dietary Composition mammal (39%), insect (60%), other (6%) percent composition of sample pellets (by volume) Both Male and Female Adult 95 pellets agricultural lands Exposure Factor Datasets Yolo breeding
Dietary Composition mammal (24%), insect (74%), other (2%) percent composition of sample pellets (by volume) Both Male and Female Adult 104 pellets agricultural lands Exposure Factor Datasets Yolo breeding
Dietary Composition mammal (82%), insect (16%), other (2%) percent composition of sample pellets (by volume) Both Male and Female Adult 116 pellets agricultural lands Exposure Factor Datasets Yolo
Citation:

The effect of vegetative cover on foraging strategies, hunting success and nesting distribution of American kestrels in central Missouri

Author(s)
Toland, Brian R.
Pages
14-20
Year
Volume
21
Exposure Endpoint Type Endpoint Value Units Sex Life Cycle Stage Sample Size Location Type Condition
Population Density 48 individuals in 175 km2 Both Male and Female Both Adults and Juveniles 1 study area agricultural lands, woodlots, meadows Exposure Factor Datasets
Population Density 50 individuals in 175 km2 Both Male and Female Adult 1 study area agricultural lands, woodlots, meadows Exposure Factor Datasets Breeding
Citation:

Influence of nest-box placement and density on abundance and productivity of American kestrels in central Missouri

Author(s)
Toland, Brian R. and William H. Elder
Pages
712-717
Year
Volume
99
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Condition
Fledging or Weaning Rate 5.0 three year mean fledging rate number of fledglings per nest Both Male and Female Fledgling 28 pairs rural and urban lands Exposure Factor Datasets Breeding
Clutch or Litter Size 5.1 mean clutch size over 3 years eggs per nest Female Adult 28 pairs rural and urban lands Exposure Factor Datasets Breeding
Population Density 0.06 mean pair density in study area (194 km2) pairs per km2 Both Male and Female Adult 5 years rural and urban lands Exposure Factor Datasets Breeding
Population Density 0.22 mean density in study area individuals per km2 Both Male and Female Both Adults and Juveniles 5 years rural and urban lands Exposure Factor Datasets
Citation:

A study of factors affecting nesting raptor populations in urban ares, Sacramento County, California - 1974

Author(s)
Vincenty, Joseph A., III
Pages
1-21
Publisher
California Department of Fish and Game, Wildlife Management Branch Administrative Report No. 74-5
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type California Counties
Fledging or Weaning Rate 2.2 fledging rate per successful nest fledglings per nest Both Male and Female Fledgling 17 American River; oak woodlands, grasslands, residential Exposure Factor Datasets Sacramento
Citation:

Nest box use and reproductive biology of the American kestrel in Lassen County, California

Author(s)
Bloom, Peter H. and Stephen J. Hawks
Pages
9-14
Year
Issue
1
Volume
17
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type California Counties
Hatching Success 79 mean hatchability measured over 4 years % Both Male and Female Hatchling 157 boxes Great Basin (elev. 1260-2340 m) Exposure Factor Datasets Lassen
Citation:

Breeding behavior of the American kestrel (sparrow hawk)

Author(s)
Willoughby, Ernest J. and Tom J. Cade
Pages
75-96
Volume
3
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Condition Lab
Duration of Incubation or Gestation 28.4 mean incubation period in captivity d Both Male and Female Embryo 5 Exposure Factor Datasets Breeding Laboratory
Clutch or Litter Size 3.66 mean clutch size in captivity eggs Female Adult 5 Exposure Factor Datasets Breeding Laboratory
Citation:

Prediction of raptor resting metabolism: comparison of measured values with statistical and biophysical estimates

Author(s)
Hayes, Stephen R. and James A. Gessaman
Year
Volume
7
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Lab
Surface Area 7.15 x 10E-3 dorsal surface area m^2 Not Reported Adult Not Reported Exposure Factor Datasets Laboratory
Surface Area 7.15 x 10E-3 ventral surface area m^2 Not Reported Adult Not Reported Exposure Factor Datasets Laboratory
Citation:

Longevity records of North American birds: Gaviidae through Alcidae

Author(s)
Clapp, Roger B., M. Kathleen Klimkiewicz and John H. Kennard
Pages
81-124
Year
Issue
2
Volume
53
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Countries
Longevity 11-07 from USFWS Bird Banding Laboratory data yr-mo Not Reported Adult 1832 band recoveries Exposure Factor Datasets USA
Citation:

Energetics of two wintering raptors

Author(s)
Koplin, James R., Michael W. Collopy, Albert R. Bammann and Howard Levenson
Pages
795-806
Year
Volume
97
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Lab
Metabolic Rate 40.8 existence metabolism as measured by the difference between food energy and energy in egesta of birds maintained at constant body mass for periods of 3 or more days kcal/d Not Reported Adult Not Reported Exposure Factor Datasets Laboratory
Citation:

Impacts of a nuclear energy facility on raptorial birds

Author(s)
Fitzner, R.E.
Pages
9-33
Publisher
U.S. Fish and Wildlife Service
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error
Fledging or Weaning Rate 4.0 average number of young fledged fledges/nest Not Reported Fledgling 4 nests Hanford Site, Benton and Franklin Counties Exposure Factor Datasets 0.41
Population Density 10 number of nesting pairs counted annually on study site pairs/1476 sq km Both Male and Female Adult 4 years Hanford Site, Benton and Franklin Counties Exposure Factor Datasets
Population Density 20 number of individual kestrels counted annually on study site individuals/1476 sq km Both Male and Female Adult 4 years Hanford Site, Benton and Franklin Counties Exposure Factor Datasets
Citation:

Growth of body components in parent- and hand-reared captive kestrels

Author(s)
Bird, David M. and Robert G. Clark
Pages
77-84
Year
Issue
3
Volume
17
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error Lab
Growth Rate 0.250 growth rate of body weight in parent-reared birds Male Nestling 11 birds Exposure Factor Datasets Laboratory
Growth Rate 0.239 growth rate of body weight in parent-reared birds Female Nestling 8 birds Exposure Factor Datasets Laboratory
Body Weight - Mean 113.4 average body weight g Male Adult 25 birds Exposure Factor Datasets 2.0 SE Laboratory
Body Weight - Mean 120.2 average body weight g Female Adult 26 birds Exposure Factor Datasets 5.3 SE Laboratory
Citation:

Food consumption of a sparrow hawk

Author(s)
Wing, Leonard and Anne H. Wing
Pages
168-170
Year
Volume
41
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Condition Lab
Food Ingestion Rate 43.6 average and range of daily caloric intake (food provided ad libidum) cal/d Male Adult 1 bird Exposure Factor Datasets sedentary, injured Laboratory
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 Condition Lab
Population Density 1 density of nesting pairs pair/1.1 mi^2 Both Male and Female Adult 10 nests Jackson Hole Exposure Factor Datasets
Clutch or Litter Size 4.4 eggs/clutch Female Adult 10 nests Jackson Hole Exposure Factor Datasets
Hatching Success 2 percent of eggs that failed to hatch % Not Reported Nestling 10 nests Jackson Hole Exposure Factor Datasets
Time of Nesting May 20 to Jul 20 period from earliest egg laying date to date of latest brood departure Both Male and Female Adult 11 nests Jackson Hole Exposure Factor Datasets
Time of Hatching or Parturition Jun 20-Jun 22 dates of earliest and latest hatching Not Reported Nestling 11 nests Jackson Hole Exposure Factor Datasets
Territory Size observed range of movement, based on observations of individuals mi^2 Not Reported Adult 8 birds Superior Township Exposure Factor Datasets
Fledging or Weaning Rate 4.2 number of fledglings produced per pair fledglings/pair Not Reported Fledgling 10 nests Jackson Hole Exposure Factor Datasets
Territory Size observed range of movement during nesting, based on observations of individual or pair movements mi^2 Not Reported Adult 11 birds Jackson Hole Exposure Factor Datasets
Dietary Composition white-footed mice (6.0%), meadow mice (78.9%), shrews (1.3%), pocket gopher (1.0%), uinta ground squirrel (0.3%), sm-med sized birds (5.7%), insects (59.9%) percent occurrence of prey items in pellets during nesting % Not Reported Not Reported 299 pellets from 8 nests Jackson Hole Exposure Factor Datasets
Food Ingestion Rate averages of food amounts eaten per day g Both Male and Female Not Reported 3 birds Exposure Factor Datasets captive Laboratory
Citation:

Effects of macrohabitat and microhabitat on nest-box use and nesting success of American kestrels

Author(s)
Rohrbaugh, Ronald W., Jr., and Richard H. Yahner
Pages
410-423
Year
Issue
3
Volume
109
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Fledging or Weaning Rate 49% mean percent of successful nests per year % Both Male and Female Adult 259 nesting attempts Berks and Lehigh counties Exposure Factor Datasets
Citation:

Use of free ranging American kestrels and nest boxes for contaminant risk assessment sampling: a field application

Author(s)
Craft, Randall A. and Karen P. Craft
Pages
207-212
Year
Issue
4
Volume
30
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size 4.4 mean clutch size (4 sample years) eggs/clutch Female Adult 7-23 nests/year Lucas and Wayne Counties (40deg57'N, 93deg18'W) Exposure Factor Datasets
Fledging or Weaning Rate 89% mean percent of young hatched that fledged (4 sample years) % Not Reported Juvenile 148 hatchlings Lucas and Wayne Counties (40deg57'N, 93deg18'W) Exposure Factor Datasets
Hatching Success 68% mean percent of eggs hatched of total eggs laid (4 sample years) % Not Reported Juvenile 217 eggs Lucas and Wayne Counties (40deg57'N, 93deg18'W) Exposure Factor Datasets
Citation:

American kestrel reproduction and dispersal in central Wisconsin

Author(s)
Jacobs, Eugene A.
Pages
135-137
Year
Issue
2
Volume
29
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size 4.1 mean brood size (13 sample years) young/nest Not Reported Juvenile 37 successful nests Portage County (44deg27'N, 89deg40'W) Exposure Factor Datasets

Great Horned Owl (Bubo virginianus)

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 Sample Size Location Type
Growth Rate 0.1900 growth constant based on logistic growth equation Female Nestling 1 owl Delaware County 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 Units Sex Life Cycle Stage Sample Size Location Type Condition
Time of Mating/ Laying February (peak), March (end) egg laying dates Female Adult 16 nests Pima and Pinal Counties Exposure Factor Datasets breeding
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
Citation:

Impacts of a nuclear energy facility on raptorial birds

Author(s)
Fitzner, R.E.
Pages
9-33
Publisher
U.S. Fish and Wildlife Service
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Error
Clutch or Litter Size 3.0 average clutch size eggs/clutch Female Adult 12 nests Hanford Site, Benton and Franklin Counties Exposure Factor Datasets 0.56
Hatching Success 2.67 average number of young hatched hatches/nest Not Reported Nestling 12 nests Hanford Site, Benton and Franklin Counties Exposure Factor Datasets 1.09
Fledging or Weaning Rate 2.67 average number of young fledged fledglings/nest Not Reported Fledgling 12 nests Hanford Site, Benton and Franklin Counties Exposure Factor Datasets 1.09
Population Density range of numbers of nesting pairs counted annually on a 1476 sq km study site pairs/study site Both Male and Female Adult 4 years Hanford Site, Benton and Franklin Counties Exposure Factor Datasets
Population Density range of numbers of individual owls counted annually on a 1476 sq km study site individuals/study site Both Male and Female Adult 4 years Hanford Site, Benton and Franklin Counties Exposure Factor Datasets
Citation:

The nesting, reproductive performance, and chlorinated hydrocarbon residues in the red-tailed hawk and great horned owl in south-central Montana

Author(s)
Seidensticker, John C. and Harry V. Reynolds
Pages
408-418
Year
Issue
4
Volume
83
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type
Time of Nesting mid-Feb to Jun 20 period from first territory selection to last brood fledged Both Male and Female Adult 15 nests south-central Montana Exposure Factor Datasets
Fledging or Weaning Rate 64% percent of nests known to fledge young Not Reported Fledgling 11 nests south-central Montana Exposure Factor Datasets
Hatching Success 100% percent of eggs hatched in nests that produced young Not Reported Nestling 11 nests south-central Montana Exposure Factor Datasets
Citation:

Monitoring great horned owls for pesticide exposure in southcentral Iowa

Author(s)
Buck, Jeremy A., Larry W. Brewer, Michael J. Hooper, George P. Cobb and Ronald J. Kendall
Pages
321-331
Year
Issue
2
Volume
60
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Home Range home range size (minimum convex polygon model) as determined by radiotelemetry ha Not Reported Not Reported 22 owls Exposure Factor Datasets
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 Condition Lab
Foraging Distance 0.25 typical maximum distance between two roosting sites mi Both Male and Female Adult 11 home ranges Superior and Ann Arbor townships Exposure Factor Datasets
Population Density 1 bird/2000 acres Both Male and Female Not Reported 11 owls Superior township Exposure Factor Datasets
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
Clutch or Litter Size 2.2 eggs/clutch Female Adult 4 nests Jackson Hole Exposure Factor Datasets
Hatching Success 11 percent of eggs that failed to hatch Not Reported Nestling 4 nests Jackson Hole Exposure Factor Datasets
Fledging or Weaning Rate 2 number of fledglings produced per pair fledglings/pair Not Reported Fledgling 4 nests Jackson Hole Exposure Factor Datasets
Territory Size observed range of movement during nesting, based on observations of individual or pair movements mi^2 Not Reported Adult 4 birds Jackson Hole Exposure Factor Datasets
Dietary Composition white-footed mice (3.6%), meadow mice (64.5%), shrews (0.3%), weasels (0.6%), red squirrel (0.3%), pocket gopher (23.5%), snowshoe rabbit (2.8%), ruffed grouse (1.4%) sage grouse (0.3%), mallard (0.6%), sm-med sized birds (1.4%), sucker (0.8%) percent occurrence of prey items in diet during nesting % Not Reported Not Reported 361 food items, 4 nests Jackson Hole Exposure Factor Datasets
Food Ingestion Rate averages of food amounts eaten per day g Both Male and Female Not Reported 2 birds Exposure Factor Datasets captive Laboratory
Citation:

Food habits of the horned and barn owls

Author(s)
Cunningham, John D.
Pages
222
Year
Volume
62
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type California Counties
Dietary Composition Neotoma fuscipes (7.9%), Thomomys bottae (20.7%), Mus musculus (25.0%), Microtus californicus (14.9%), Reithrodontomys megalotis (1.7%), Perognathus sp. (4.1%), Dipodomys agilis (4.3%), Peromyscus sp. (3.8%), Notiosorex crawfordi (0.3%), Sylvilagus sp. (0.8%), Sorex ornatus (0.1%), Scapanus latimanus (0.7%), Stenopelmatus sp (2.1%), Elgaria multicarinata (0.1%), unident. birds (4.3%) percent of total number of specimens identified in pellets Not Reported Not Reported 25 lbs of pellets Univ. of Calif., Los Angeles campus Exposure Factor Datasets Los Angeles
Dietary Composition Neotoma fuscipes (11.3), Thomomys bottae (36.2), Mus musculus (14.0), Microtus californicus (13.5), Reithrodontomys megalotis (8.7), Perognathus sp. (7.8), Dipodomys agilis (3.1), Peromyscus sp. (3.1), Notiosorex crawfordi (1.3), Sylvilagus sp. (0.5), Sorex ornatus (0.5) percent of total number of specimens identified in pellets Not Reported Not Reported Not Reported Santa Monica Mountains (1 ledge) Exposure Factor Datasets
Citation:

Growth development and reactions of young great horned owls

Author(s)
Reed, Bessie P.
Pages
14-31
Year
Volume
42
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Lab
Body Weight - Mean maximum body weights achieved by captively raised chicks oz Not Reported Juvenile 2 birds captured in Kansas Exposure Factor Datasets Laboratory
Citation:

Movements, population fluctuations, and mortality among great horned owls

Author(s)
Stewart, Paul A.
Pages
155-162
Year
Issue
2
Volume
81
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type Countries
Survival/ Mortality 46% mean percent mortality within the first year of banding based on band return data, 1951-1962 Not Reported Juvenile 97 birds Exposure Factor Datasets CANADA, USA
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 Units Sex Life Cycle Stage Sample Size Location Type California Counties
Population Density density based on call counts birds/2000 ac Both Male and Female Both Adults and Juveniles 7 counts San Joaquin Experimental Range Exposure Factor Datasets Madera
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:

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:

Prey of nesting red-tailed hawks and great horned owls on Lostwood National Wildlife Refuge, northwestern North Dakota

Author(s)
Murphy, Robert K.
Pages
145-149
Year
Issue
3
Volume
55
Exposure Endpoint Type Endpoint Value Endpoint Description Sex Life Cycle Stage Sample Size Location Type
Dietary Composition meadow vole and jumping mouse (11.3%), juv. white-tailed jackrabbit (9.4%), horned or eared grebe (5.7%), American coot (22.6%), sora and Virginia rails (3.8%), duck (26.4%), sharp-tailed grouse (9.4%), blackbird (11.3%) relative frequency of prey species occurence in nests Not Reported Nestling 78 nest visits Lostwood National Wildlife Refuge Exposure Factor Datasets
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