Northern Rubber Boa - Charina bottae
FWP Conservation Tier
This snake looks and feels like rubber, hence its name. It is a small, shiny, stout snake (12 to 28 inches) with very small eyes and a blunt tail. The scales are small and smooth, except for those on the head, which are enlarged. Dorsum of adult is plain brown to olive green, venter is cream to yellow, sometimes with dark flecks or brown, orange, or black mottling; young are pinkish to tan above, light yellow to pink below. Top of head is covered with large symmetrical plates; pupil is vertically oval. Males and some females have a spur on each side in the anal region. Total length of adults usually is 35 to 83 cm (Stebbins 1985).
The Eastern Racer is much more active, has larger eyes, and has a thin, tapered tail.
Western Hemisphere Range
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
(Records associated with a range of dates are excluded from time charts)
Rubber Boas are secretive, slow-moving, docile snakes, usually found under logs and rocks in either moist or dry forest habitats. They are primarily nocturnal, but occasionally may be observed sunning on roads, trails, or in open areas. They feed primarily on small mice but also take shrews, salamanders, snakes, and lizards. Two to eight young are born alive in late summer or early fall. In Mission Mountains, were usually found in large talus slides or under logs/rocks near slides (Brunson and Demaree 1951) or in leaf-litter in deep shaded Douglas-fir/cedar forest (Franz 1971). Often found in areas with many flat rocks and near water (Baxter and Stone 1980).
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 firstname.lastname@example.org
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.
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- Commonly Associated with these Ecological Systems
Forest and Woodland Systems
Shrubland, Steppe and Savanna Systems
Wetland and Riparian Systems
- Occasionally Associated with these Ecological Systems
Shrubland, Steppe and Savanna Systems
One found dead on road contained a Microtus longicaudus (Brunson and Demaree 1951).
In western OR, found in variety of habitats except areas with regular grazing or cultivation, or areas periodically flooded (Hower 1974). Largely crepuscular or nocturnal (Stebbins 1954).
Probably mate later inland. In eastern OR, mate late April to early May. Young usually born in September (Nussbaum 1983). Reported parturition dates are September (UT) and September 20 to 21 (WA). Average number of young is 4.4 (2 to 8) (Fitch and Fleet 1970).
- Additional ReferencesLegend: View WorldCat Record View Online Publication
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