Mojave River Valley Museum
Desert Wildlife >
Family: Tytonidae Order: Strigiformes Class: Aves
DISTRIBUTION, ABUNDANCE, AND SEASONALITY
Common, yearlong resident in open habitats including grassland, chaparral, riparian, and
other wetlands. Occurs throughout the state from sea level to 1680 m (0-5500 ft), avoiding
dense forests and open desert habitats. Often found in vicinity of human communities
(Grinnell and Miller 1944). Resident of all Channel Islands except San Nicolas (Garrett and
SPECIFIC HABITAT REQUIREMENTS
Feeding: Feeds primarily upon
mice, rats, voles, pocket gophers, and ground squirrels.
Also eats shrews,
and amphibians. Small birds, such as
blackbirds, important food in winter. Hunts on the wing, from a perch, hovers, stoops, in open
fields, wetlands, and grasslands.
Cover: Dense foliage of trees and shrubs, buildings, and cliffs used for roosting cover.
Reproduction: Usually nests on ledges, crevices, or other sheltered areas of cliffs or
human-made structures. Also nests in cavities in trees or snags, burrows, culverts, or nest
boxes (Reese 1972, Call 1978).
Water: Most water needs apparently met by food.
Pattern: Uses open habitats for hunting near cliffs, ledges, human-made structures, or
trees or snags, which provide roost and nest sites.
SPECIES LIFE HISTORY
Activity Patterns: Active yearlong. Primarily a nocturnal hunter, with
Seasonal Movements/Migration: Not migratory.
Home Range: Pair retains roughly the same home range throughout the year. Evans and
Emlen (1947) reported a hunting range of about 67 ha (165 ac) near Davis. Minimum home
range in Oregon was estimated to be 2.0 km˛ (0.8 mi˛) per pair (Thomas 1979).
Territory: In Utah, an area 5-9 m (15-30 ft) around the nest was defended (Smith et al.
Reproduction: Monogamous; most breeding occurs January through November. Clutch
size 3-11, usually 5-7. Often produces 2 broods per yr. Brood size averaged 2.8 to 4.7 in
southern California (Henny 1969). Gallup (1949) found a mean of 4.2 young per nest from
1928-1946 in San Diego Co. Incubation 21-24 days (Bent 1938, Smith et al. 1974); young
fledge at 52-70 days (Pickwell 1948). Male feeds female during incubation; male and female
brood. Clutch size and fledging success apparently affected by prey availability and severity
of preceding winter.
of young include
great horned owls, and
(Bent 1938, Carnie 1954). Great horned owls apparently are strong competitors for food in
some areas (Smith and Marti 1976).
Bent, A. C. 1938. Life histories of North American birds of prey. Part 2. U.S. Natl. Mus. Bull.
Bertrand, G. A., and J. M. Scott. 1979. Checklist of the birds of Oregon. Audubon Soc. of
Corvallis. Corvallis, OR. 17pp.
Bloom, P. H. 1979. Ecological studies of the barn owl in California. Pages 36-39 in P. P.
Schaeffer and S. M. Ehlers, eds. Proc. Natl. Audubon Soc. Sympos. on owls of the west.
Natl. Audubon Soc. West. Educ. Cent., Tiburon, CA. 97pp.
Call, M. W. 1978. Nesting habits and survey techniques for common western raptors.
U. S. Dep. Inter., Bur. Land Manage., Portland, OR. Tech. Note No. 316. 115pp.
Carnie, S. K. 1954. Food habits of nesting golden eagles in the coast ranges of California.
Craighead, J. J., and F. C. Craighead, Jr. 1956. Hawks, owls and wildlife. Stackpole Books,
Harrisburg, PA. 443pp.
Ehrlich, P. R., D. S. Dobkin, and D. Wheye. 1988. The birder's handbook. Simon and
Schuster, New York. 785pp.
Evans, F. C., and J. T. Emlen, Jr. 1947. Ecological notes on the prey selection by a barn
owl. Condor 49:3-9.
Gallup, F. N. 1949. Brood size in the barn owl. Condor 51:189.
Garrett, K., and J. Dunn. 1981. Birds of southern California. Los Angeles Audubon Soc.
Grinnell, J., and A. H. Miller. 1944. The distribution of the birds of California. Pac. Coast
Avifauna No. 27. 608pp.
Guiguet, C. J. 1960. The Birds of British Columbia (7). The owls. Brit. Col. Prov. Mus.,
Vancouver. Handb. No. 18. 62pp.
Henny, C. J. 1969. Geographical variation in mortality rates and production requirements of
the barn owl (Tyto alba). Bird-Banding 40:277-290.
Karalus, K. E., and A. W. Eckert. 1974. The owls of North America. Doubleday Co., Garden
City, NY. 278pp.
Marti, C. D. 1974. Feeding ecology of four sympatric owls. Condor 76:45-61.
Payne, R. S. 1962. How the barn owl locates prey by hearing. Living Bird 1:151-159.
Pickwell, G. 1948. Barn owl growth and behaviorisms. Auk 65:359-373.
Reese, J. G. 1972. A Chesapeake barn owl population. Auk 89:106-114.
Smith, D. G., and C. D. Marti. 1976. Distributional status and ecology of barn owls in Utah.
Raptor Res. 10:33-44.
Smith, D. G., C. R. Wilson, and H. H. Frost. 1974. History and ecology of a colony of barn
owls in Utah. Condor 76:131-136.
Thomas, J. W., ed. 1979. Wildlife habitats in managed forests: The Blue Mountains of
Oregon and Washington. U.S. Dept. Agric., For. Serv., Portland, OR. Agric. Handb. No.
Udvardy, M. D. F. 1977. The Audubon Society field guide to North American birds: western
region. A. Knopf, New York. 855pp.
California Department of Fish and Game. California Interagency
Wildlife Task Group. 2005. California Wildlife Habitat Relationships version 8.1 personal computer program. Sacramento, California.
The nocturnal Barn Owl likes to hunt in areas such as canyons and washes near trees
where it can perch. This 15-20 inch tall
mammals such as
antelope squirrels and mice, but when scarce will
attack small birds. After being caught the
prey is torn apart and swallowed bones and all. Mostly white with
yellow, tan and buff speckled markings, the distinctive heart-shaped white face is
rimmed by curved tan feathers.
The Barn owl is a raptor.
For more information on raptors, click here.
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