Burrowing Owl - Athene cunicularia
State Rank Reason (see State Rank above)
Species has a negative short-term population trend.
- Details on Status Ranking and Review
ScoreU - Unknown
ScoreG - 200,000-2,500,000 km squared (about 80,000-1,000,000 square miles)
Comment310,345 square kilometers based on Natural Heritage Program range maps that appear on the Montana Field Guide
Area of Occupancy
ScoreU - Unknown
ScoreD - Moderate Decline (decline of 25-50%)
CommentProbably have lost >25% of prairie dog habitat in Montana since European arrival. Extirpated from B.C. where reintroduction efforts have reestablished small numbers. Also, range has contracted in Minnesota and other portions of Canada. Evidence suggests populations have declined due to habitat loss, pesticides, predators, and vehicle collisions. Human shooting and nest burrow disturbance have been a significant problem in some areas.
ScoreD - Declining. Decline of 10-30% in population, range, area occupied, and/or number or condition of occurrences
CommentBBS data for Montana is of very moderate credibility and shows an insignificant negative trend from 1966 to 2009 of -1.6% per year or -15% decline per decade. Between 1999 and 2009 there is an insignificant +2% increase per year or a +22% increase per decade. Most surrounding states and provinces east of the Continental Divide with credible data show evidence for declines. Thus, the short-term trend is probably best regarded as negative.
ScoreF - Widespread, low-severity threat. Threat is of low severity but affects (or would affect) most or a significant portion of the population or area.
CommentLoss of prairie dogs is the greatest threat to the species. Evidence suggests populations have declined due to habitat loss, pesticides, predators, and vehicle collisions. Human shooting and nest burrow disturbance have been a significant problem in some areas. Vehicle collisions result from owls sitting on roads at night while hunting.
SeverityLow - Low but nontrivial reduction of species population or reversible degradation or reduction of habitat in area affected, with recovery expected in 10-50 years.
CommentSpecies should recover from declines within 10-50 years if burrow habitats and/or prairie dogs are present.
ScopeModerate - 20-60% of total population or area affected
Comment>20% of prairie dog habitat is being impacted or threatened.
ImmediacyModerate - Threat is likely to be operational within 2-5 years.
ScoreC - Not Intrinsically Vulnerable. Species matures quickly, reproduces frequently, and/or has high fecundity such that populations recover quickly (< 5 years or 2 generations) from decreases in abundance; or species has high dispersal capability such that extirpated populations soon become reestablished through natural recolonization (unaided by humans).
ScoreB - Narrow. Specialist. Specific habitat(s) or other abiotic and/or biotic factors (see above) are used or required by the Element, but these key requirements are common and within the generalized range of the species within the area of interest.
CommentNarrow Specialist. Dependent on burrow habitats which are still widespread because prairie dogs are fairly widespread.
Raw Conservation Status Score
3.5 + 0.0 (geographic distribution) + 0.0 (environmental specificity) -0.25 (short-term trend) + 0.0 (threats) = 3.25
How Scores are Calculated
Burrowing Owls are probably most distinguishable because of their ground-dwelling behavior. They may also be identified by their long legs, round, tuft-less head, and bright yellow eyes. The distinct oval facial ruff is framed by a buffy white eyebrow-to-malar stripe near the bill (Haug et al. 1993). The primary feathers of their relatively long, rounded wings are brown with buffy-white barring. Their tail is short and also decorated with this same brown with buffy-white barring. The back, scapulars, and crown are brown with buffy-white spotting (Haug at al. 1993). The underparts are a buffy-white with broad brown barring, while the throat and undertail coverts are white (Haug et al. 1993). The bill is pale, cream colored to yellowish-white or greenish-yellow (Haug et al. 1993). As with other owl species, females may be darker than males, especially in worn plumage. Juveniles are similar to the adults, except the head is plain brown, the upper chest has a dark tan band, and the lower chest and belly are light-to-white in color.
This owl averages 24 cm (9.5 inches) long with a wingspan of 53 cm (21 inches), and a weight of approximately 155 grams (5 onces) (Sibley 2000).
The male call is described as a high nasal trumpeting "coo-coo", which may be answered by the female with a short clear "eeep" or a harsh rasping "ksshh" (Sibley 2000). A rasping alarm call is made by both sexes. Vocalizations heard year round include short, sharp husky "chuk" or a series of barking notes, with a rasping scream described as "kwee-ch-ch-ch-ch" or "cheee-twikit-twik" (Sibley 2000).
Burrowing Owls can be identified from other owl species by the fact that they live in the ground. They are found in open grassland habitat where they nest and roost in abandoned animal burrows. In addition to perching on the lip of their prairie burrows, these owls may be observed on fence posts. They are also active during both the day and night. An owl species common in Montana, which also may be seen on the ground, is the Short-eared Owl. This species, however, is about twice the size of the Burrowing Owl, has dark patches on the wings and at the eyes, short ear tufts, a dark bill, and does not nest is burrows (it nests in a scrape in the ground) (Ehrlich et al. 1988).
Summary of Observations Submitted for Montana
Number of Observations:
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
(direct evidence "B")
(indirect evidence "b")
No evidence of Breeding
(regular observations "W")
(at least one obs. "w")
(Records associated with a range of dates are excluded from time charts)
Burrowing Owls are migratory in the northern portion of their range, which includes Montana. The extreme dates of observation for Burrowing Owls in this state are, at the earliest, March and, the latest, October (Lenard et al. 2003). The majority of the spring reports for this species occur, however, in April with most fall observations in September.
Some U.S./Canadian breeders winter in Mexico and possibly in Central America (James and Ethier 1989). Canadian breeders are believed to winter south of the U.S.-Mexico border.
Burrowing Owls are found in open grasslands, where abandoned burrows dug by mammals such as ground squirrels (Spermophilus spp.), prairie dogs (Cynomies spp.) and Badgers (Taxidea taxus) are available. Black-tailed Prairie Dog (Cynomys ludoviscianus) and Richardson's Ground Squirrel (Spermophilus richardsonii) colonies provide the primary and secondary habitat for Burrowing Owls in the state (Klute et al. 2003). The burrows may be enlarged or modified, making them more suitable. Burrowing Owls spend much time on the ground or on low perches such as fence posts or dirt mounds.
Ecological Systems Associated with this Species
- Details on Creation and Suggested Uses and Limitations
How Associations Were Made
We associated the use and habitat quality (high, medium, or low) of each of the 82 ecological systems mapped in Montana for
vertebrate animal species that regularly breed, overwinter, or migrate through the state by:
- Using personal observations and reviewing literature that summarize the breeding, overwintering, or migratory habitat requirements of each species (Dobkin 1992, Hart et al. 1998, Hutto and Young 1999, Maxell 2000, Foresman 2001, Adams 2003, and Werner et al. 2004);
- Evaluating structural characteristics and distribution of each ecological system relative to the species’ range and habitat requirements;
- Examining the observation records for each species in the state-wide point database associated with each ecological system;
- Calculating the percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system to get a measure of “observations versus availability of habitat”.
Species that breed in Montana were only evaluated for breeding habitat use, species that only overwinter in Montana were only evaluated for overwintering habitat use, and species that only migrate through Montana were only evaluated for migratory habitat use.
In general, species were associated as using an ecological system if structural characteristics of used habitat documented in the literature were present in the ecological system or large numbers of point observations were associated with the ecological system.
However, species were not associated with an ecological system if there was no support in the literature for use of structural characteristics in an ecological system, even if
point observations were associated with that system.
High, medium, and low habitat quality was assigned based on the degree to which the structural characteristics of an ecological system matched the preferred structural habitat characteristics for each species in the literature.
The percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system was also used to guide assignments of habitat quality.
If you have any questions or comments on species associations with ecological systems, please contact Bryce Maxell at email@example.com
or (406) 444-3655.
Suggested Uses and Limitations
Species associations with ecological systems should be used to generate potential lists of species that may occupy broader landscapes for the purposes of landscape-level planning.
These potential lists of species should not be used in place of documented occurrences of species (this information can be requested at: http://mtnhp.org/requests/default.asp
) or systematic surveys for species and evaluations of habitat at a local site level by trained biologists.
Users of this information should be aware that the land cover data used to generate species associations is based on imagery from the late 1990s and early 2000s and was only intended to be used at broader landscape scales.
Land cover mapping accuracy is particularly problematic when the systems occur as small patches or where the land cover types have been altered over the past decade.
Thus, particular caution should be used when using the associations in assessments of smaller areas (e.g., evaluations of public land survey sections).
Finally, although a species may be associated with a particular ecological system within its known geographic range, portions of that ecological system may occur outside of the species’ known geographic range.
- Adams, R.A. 2003. Bats of the Rocky Mountain West; natural history, ecology, and conservation. Boulder, CO: University Press of Colorado. 289 p.
- Dobkin, D. S. 1992. Neotropical migrant land birds in the Northern Rockies and Great Plains. USDA Forest Service, Northern Region. Publication No. R1-93-34. Missoula, MT.
- Foresman, K.R. 2001. The wild mammals of Montana. Special Publication No. 12. Lawrence, KS: The American Society of Mammalogists. 278 p.
- Hart, M.M., W.A. Williams, P.C. Thornton, K.P. McLaughlin, C.M. Tobalske, B.A. Maxell, D.P. Hendricks, C.R. Peterson, and R.L. Redmond. 1998. Montana atlas of terrestrial vertebrates. Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT. 1302 p.
- Hutto, R.L. and J.S. Young. 1999. Habitat relationships of landbirds in the Northern Region, USDA Forest Service, Rocky Mountain Research Station RMRS-GTR-32. 72 p.
- Maxell, B.A. 2000. Management of Montana’s amphibians: a review of factors that may present a risk to population viability and accounts on the identification, distribution, taxonomy, habitat use, natural history, and the status and conservation of individual species. Report to U.S. Forest Service Region 1. Missoula, MT: Wildlife Biology Program, University of Montana. 161 p.
- Werner, J.K., B.A. Maxell, P. Hendricks, and D. Flath. 2004. Amphibians and reptiles of Montana. Missoula, MT: Mountain Press Publishing Company. 262 p.
- Commonly Associated with these Ecological Systems
Open Water / Wetland and Riparian Systems
Shrubland, Steppe and Savanna Systems
Sparse and Barren Systems
- Occasionally Associated with these Ecological Systems
Open Water / Wetland and Riparian Systems
Burrowing Owls are opportunistic feeders; their diet is varied and may depend upon the time of year. Invertebrates comprise the majority of their diet in most areas, but small mammals, amphibians, reptiles, and birds may also be consumed (Haug et al. 1993).
Burrowing Owls have been found using Badger holes in the Bozeman latilong (Skaar 1969). Generally, the reported densities of Burrowing Owls varied from different locations: 8 pairs per square kilometer were found in California; 3.5 to 6 hectares per pair in North Dakota; and 13 to 16 hectares per pair in Saskatchewan.
Territorial defense is mainly limited to the immediate vicinity of nest burrow and individuals may share foraging areas.
Home ranges for Burrowing Owls in Saskatchewan were found to be 0.14 to 4.81 square kilometers; with 95% of all movements within 600 meters of the nest burrow (Haug and Oliphant 1990). Significantly smaller home ranges were reported in Saskatchewan (0.08 to 0.49, average 0.35 square kilometers) during periods of small mammal superabundance (Sissons et al. 1998, Wellicome 1998). Dispersing young use satellite burrows in the vicinity of their natal burrows for about two months after hatching before departing the natal area (King and Belthoff 2001).
The Badger plays an important role in the nesting ecology of Burrowing Owls in northern Oregon. This mammalian species provides nest burrows and can be a major predator of Burrowing Owls (Green and Anthony 1989).
Breeding of Burrowing Owls is well documented in the state. Since this owl species is so tied to prairie dogs and ground squirrels, both species occuring primarily east of the Continental Divide, the majority of confirmed breeding records for Burrowing Owls are also east of the Divide (Klute et al. 2003). The nest chamber, located within a mammal burrow, may be lined with horse dung, cow chips, dry grass, pellets, or feathers; they may occasionally be unlined (Ehrlich et al. 1988). Clutch size averages 6 to 7. The female incubates the elliptical (almost spherical at times), smooth, glossy-white eggs (31x26 mm in size) for 27 to 30 days (Baicich and Harrison 1997). The male provides food during incubation and the early nestling stages. The young owls can run and forage at 4 weeks and can sustain flight at 6 weeks. The average number of fledglings per brood is three to five. This species may first breed at one year of age; generally one brood per year is produced.
No specific management activities directed at the conservation of this species in Montana are documented. Recreational shooting of prairie dogs in their colonies, however, has the potential to cause direct illegal mortality to this owl species (Klute et al. 2003). Systematic suppression of prairie dogs by state agricultural agencies reduces Burrowing Owl habitat, but the overall impact of these activities in combination with recreational shooting has not been studied (Klute et al. 2003).
- Additional ReferencesLegend: View WorldCat Record View Online Publication
Do you know of a citation we're missing?
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