Wilson's Snipe - Gallinago delicata
The usual view of the Wilson's Snipe is as it flushes from grass or sedges, escaping in rapid, zigzag flight while uttering a rasping "scaipe
." It is a medium-sized sandpiper (length about 28 cm, mass about 100 g), with long straight bill (about 6 cm). Sexually monomorphic plumage; no obvious seasonal or age differences. Crown striped with black and buffy, upperparts a mixture of brown, black, and gray, forming spots and barring; light colored spots tend to form 4 lines running down the back; tail appears russet. Underparts mostly white, but neck and breast heavily streaked or spotted with brown (Mueller 1999.)
For a comprehensive review of the conservation status, habitat use, and ecology of this and other Montana bird species, please see Marks et al. 2016, Birds of Montana.
Western Hemisphere Range
Wilson's Snipes breed throughout the state. Most wintering records are for western Montana (Skaar et al. 1985).
Observations in Montana Natural Heritage Program Database
Number of Observations:
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
SUMMER (Feb 16 - Dec 14)
Direct Evidence of Breeding
Indirect Evidence of Breeding
No Evidence of Breeding
WINTER (Dec 15 - Feb 15)
Not Regularly Observed
(Observations spanning multiple months or years are excluded from time charts)
In Belgrade fall migration peaks were October 14 to 31 (1976, 1977). The Bozeman migration period was from March 25 to April 15, and from August 15 to October 20; no peaks were noted (Skaar 1969).
In the Bozeman area, summer birds are widely distributed in the valley in moist meadows. In winter, they occur along warm, bog-bordered streams in the valley (Skaar 1969). Breeds in sedge bogs, fens, willow and alder swamps, and marshy edges of ponds, rivers, and brooks. Requires soft organic soil rich in food organisms just below surface, with clumps of vegetation offering both cover and good view of approaching predators. Avoids marshes with tall, dense vegetation (cattails, reeds, etc.) (Mueller 1999).
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 (common or occasional) 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 2012, 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 observation 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 listed as associated with 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 listed as 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.
Common versus occasional association with an ecological system was assigned based on the degree to which the structural characteristics of an ecological system matched the preferred structural habitat characteristics for each species as represented in scientific 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 assignment of common versus occasional association.
If you have any questions or comments on species associations with ecological systems, please contact the Montana Natural Heritage Program's Senior Zoologist.
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: mtnhp.org/requests
) 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. 2012. Mammals of Montana. Second edition. Mountain Press Publishing, Missoula, Montana. 429 pp.
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- Commonly Associated with these Ecological Systems
Forest and Woodland Systems
Human Land Use
Wetland and Riparian Systems
- Occasionally Associated with these Ecological Systems
Human Land Use
Recently Disturbed or Modified
Eats mostly larval insects, but also takes crustaceans, earthworms, and mollusks. Stomachs contain as much as 66% plant material, but probably little or no energy is obtained from plants (Mueller 1999).
Around Montana, the number of breeding pairs per 100 hectars ranged from 8 to 50. In 1976, 84% of the Wilson's Snipe harvest was in the Pacific flyway portion of the state, and this was felt to reflect the breeding density of Wilson's Snipes within the state.
Places nest on ground, well concealed in grass, sedge, or sphagnum moss. Sometimes overhung by willow, alder, or other brush. Eggs are ovate pyriform in shape and either dark, olive brown or pale olive brown in color with spots (Mueller 1999). In the Belgrade area the peak hatch was in the last week of May and the first 2 weeks of June. 95% of the nests were successful. Clutch size averages 4. Nest sites chosen had stands of Carex with residual vegetation. Nesting records are from May 14 to mid-June (Davis 1961).
- Literature Cited AboveLegend: View Online Publication
- Davis, C.V. 1961. A distributional study of the birds of Montana. Ph.D. Dissertation. Corvallis, OR: Oregon State University. 462 p.
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- Additional ReferencesLegend: View Online Publication
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- Additional Sources of Information Related to "Birds"