Hawks, Owls and Wildlife

Author(s)

Craighead, John J. and Frank C. Craighead, Jr.

Year

Wed, 01/01/1969 - 12:00

Article Title

Hawks, Owls and Wildlife

Book Title

Hawks, Owls and Wildlife

Publisher

Dover Publications, Inc.

Address

New York, N.Y.

Pages

443

Start Page Number

443

Review

Datapoints

Displaying 1 - 20 of 22 datapoints.

Species: Great Horned Owl (Bubo virginianus)
Exposure Endpoint Type	Endpoint Description	Endpoint Value	Sample Size	Units	Condition	Life Cycle Stage	Specific Location	Range	Type
Food Ingestion Rate	averages of food amounts eaten per day		2 birds	g	captive	Not Reported		82-85	Exposure Factor Datasets
Foraging Distance	typical maximum distance between two roosting sites	0.25	11 home ranges	mi		Adult	Superior and Ann Arbor townships		Exposure Factor Datasets
Population Density		1	11 owls	bird/2000 acres		Not Reported	Superior township		Exposure Factor Datasets
Dietary Composition	percent occurrence of prey items in pellets	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%)	297 pellets from 14 owls			Not Reported	Superior township		Exposure Factor Datasets
Time of Nesting	period from earliest egg laying date to date of latest brood departure	Mar 12 - Jun 4	4 nests			Adult	Jackson Hole		Exposure Factor Datasets
Fledging or Weaning Rate	number of fledglings produced per pair	2	4 nests	fledglings/pair		Fledgling	Jackson Hole		Exposure Factor Datasets
Time of Hatching or Parturition	earliest hatching date	Apr 14	4 nests			Nestling	Jackson Hole		Exposure Factor Datasets
Population Density	density of nesting pairs	1	4 nests	pair/3 mi^2		Adult	Jackson Hole		Exposure Factor Datasets
Clutch or Litter Size		2.2	4 nests	eggs/clutch		Adult	Jackson Hole	2-3	Exposure Factor Datasets
Territory Size	observed range of movement during nesting, based on observations of individual or pair movements		4 birds	mi^2		Adult	Jackson Hole	0.45-1.11	Exposure Factor Datasets
Hatching Success	percent of eggs that failed to hatch	11	4 nests			Nestling	Jackson Hole		Exposure Factor Datasets
Dietary Composition	percent occurrence of prey items in diet during nesting	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%)	361 food items, 4 nests	%		Not Reported	Jackson Hole		Exposure Factor Datasets

Species: American Kestrel (Falco sparverius)
Exposure Endpoint Type	Endpoint Description	Endpoint Value	Sample Size	Units	Condition	Life Cycle Stage	Specific Location	Range	Type
Hatching Success	percent of eggs that failed to hatch	2	10 nests	%		Nestling	Jackson Hole		Exposure Factor Datasets
Food Ingestion Rate	averages of food amounts eaten per day		3 birds	g	captive	Not Reported		18-21	Exposure Factor Datasets
Time of Nesting	period from earliest egg laying date to date of latest brood departure	May 20 to Jul 20	11 nests			Adult	Jackson Hole		Exposure Factor Datasets
Time of Hatching or Parturition	dates of earliest and latest hatching	Jun 20-Jun 22	11 nests			Nestling	Jackson Hole		Exposure Factor Datasets
Territory Size	observed range of movement, based on observations of individuals		8 birds	mi^2		Adult	Superior Township	0.65-2.32	Exposure Factor Datasets
Fledging or Weaning Rate	number of fledglings produced per pair	4.2	10 nests	fledglings/pair		Fledgling	Jackson Hole		Exposure Factor Datasets
Territory Size	observed range of movement during nesting, based on observations of individual or pair movements		11 birds	mi^2		Adult	Jackson Hole	0.16-1.93	Exposure Factor Datasets
Population Density	density of nesting pairs	1	10 nests	pair/1.1 mi^2		Adult	Jackson Hole		Exposure Factor Datasets

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