Northern Rubber Boa - Charina bottae
(see State Rank Reason below)
State Rank Reason (see State Rank above)
Species is apparently secure and not at risk of extirpation or facing significant threats in all or most of its range.
- Details on Status Ranking and Review
ScoreF - 20,000-200,000 km squared (about 8,000-80,000 square miles)
Comment192,908 square Kilometers from Natural Heritage Program range maps
ScoreU - Unknown. Long-term trend in population, range, area occupied, or number or condition of occurrences unknown
CommentNo data on trends available
ScoreU - Unknown. Short-term trend in population, range, area occupied, and number and condition of occurrences unknown.
CommentNo data on trends available
ScoreU - Unknown. The available information is not sufficient to assign degree of threat as above. (Severity, scope, and immediacy are all unknown, or mostly [two of three] unknown or not assessed [null].)
CommentUnknown. Range is poorly defined, threats to eastern populations may exist, but are unknown at this time
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).
CommentNot Vulnerable. Species is long lived, births 2-8 young per year and has good connectivity within its habitat
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.
CommentAssociated with mesic forests and rock outcrops
Raw Conservation Status Score
3.5 + 0 (geographic distribution) + 0 (environmental specificity) + 0 ( trend) + 0 (intrinsic vulnerability) = 3.5
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
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
(Observations spanning multiple months or years 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 (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: 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. 2012. Mammals of Montana. Second edition. Mountain Press Publishing, Missoula, Montana. 429 pp.
- 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
Forest and Woodland Systems
Recently Disturbed or Modified
Shrubland, Steppe and Savanna Systems
Sparse and Barren Systems
Wetland and Riparian Systems
- Occasionally Associated with these Ecological Systems
Forest and Woodland Systems
Human Land Use
Recently Disturbed or Modified
Shrubland, Steppe and Savanna Systems
Sparse and Barren Systems
Wetland and Riparian 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 (Hoyer 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 et al. 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).
- Literature Cited AboveLegend: View Online Publication
- Baxter, G.T. and M.D. Stone. 1980. Amphibians and reptiles of Wyoming. Wyoming Game & Fish Department, Cheyenne. 137 pp.
- Brunson, R.B. and H.A. Demaree, Jr. 1951. The herpetology of the Mission Mountains, Montana. Copeia (4):306-308.
- Fitch, H.S. and R.R. Fleet. 1970. Natural history of the milk snake (Lampropeltis triangulum) in northeastern Kansas. Herpetologica 26: 387-396.
- Franz, R. 1971. Notes on the distribution and ecology of the herpetofauna of northwestern Montana. Bulletin of the Maryland Herpetological Society 7: 1-10.
- Hoyer, R.F. 1974. Description of a rubber boa (Charina bottae) population from western Oregon. Herpetologica 30(3): 275-283.
- Nussbaum, R.A., E.D. Brodie, Jr. and R.M. Storm. 1983. Amphibians and reptiles of the Pacific Northwest. University of Idaho Press. Moscow, ID. 332 pp.
- Stebbins, R.C. 1954. Amphibians and reptiles of western North America. McGraw-Hill, New York. Xxii + 528 pp.
- Stebbins, R.C. 1985. A field guide to western reptiles and amphibians. Houghton Mifflin Company, Boston. 336 pp.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- [WESTECH] Western Technology and Engineering Incorporated. 1993. Diamond Hill Project Wildlife Baseline Survey. Western Technology and Engineering, Inc., Helena, Mt.
- Agerter, K.S. 1932. A record snake found. Yellowstone Nature Notes 9(6-7): 33-34.
- Albertson, H. 1928. A new genus for Yellowstone. Yellowstone Nature Notes 5(9): 6-7.
- Bartholomew, B.D. and C. Lleyson. 1993. Charina bottae (rubber boa). Food. Herpetological Review 24(3): 105-106.
- Blainville, H.M.D. 1835. Nouvelles Annales du Museum D'Histoire Naturelle De Paris, Vol. 4, p. 289, pl. 26, figs. 1, 1b.
- Boundy, J. 2001. Herpetofaunal surveys in the Clark Fork Valley region, Montana. Herpetological Natural History 8: 15-26.
- Brunson, R.B. 1955. Check list of the amphibians and reptiles of Montana. Proceedings of the Montana Academy of Sciences 15: 27-29.
- Carpenter, C.C. 1953. An ecological survey of the herpetofauna of the Grand Teton-Jackson Hole area of Wyoming. Copeia 1953: 170-174.
- Cope, E.D. 1875. Check-list of North American Batrachia and Reptilia; with a systematic list of the higher groups, and an essay on geographical distribution. Based on the specimens contained in the U.S. National Museum. U.S. Natioanl Museum Bulletin 1: 1-104.
- Copper, W.A., C.P. Ohmart, and D.L. Dahlsten. 1978. Predation by a rubber boa on chestnut-backed chickadees in an artificial nesting site. Western Birds 9(1):41-42.
- Crother, B.I. (ed.) 2008. Scientific and standard English names of amphibians and reptiles of North America north of Mexico. SSAR Herpetological Circular No. 37:1-84.
- Cunningham, J.D. 1966b. Observations on the taxonomy and natural history of the rubber boa, Charina bottae. Southwest Naturalist 11: 298-299.
- Devitt, T.J., R.I. Hill, and S.E. Cameron. 2005. Charina bottae (rubber boa). Diet. Herpetological Review 36(2):189-190.
- Dorcas, M.E. and C.R. Peterson. 1994. Body temperature variation in free-ranging rubber boas (Charina Bottae). Journal of Idaho Academy of Science 30(1):9.
- Dorcas, M.E. and C.R. Peterson. 1997. Head-body temperature differences in free-ranging rubber boas. Journal of Herpetology 31(1): 87-93.
- Dorcas, M.E., C.R. Peterson, and M.E.T. Flint. 1997. The thermal biology of digestion in rubber boas (Charina bottae): physiology, behavior, and environmental constraints. Physiological Zoology 70(3): 292-300.
- Erwin, D.B. 1964. Some findings on newborn rubber boas, Charina b. bottae. Copeia 1964: 222-223.
- Erwin, D.B. 1974. Taxonomic status of the southern rubber boa, Charina bottae umbratica. Copeia 1974: 996-997.
- Farmer, P. and S.B. Heath. 1987. Wildlife baseline inventory, Rock Creek study area, Sanders County, Montana. Western Technology and Engineering, Inc. Helena, MT.
- Gomez, L.M., K.W. Larsen, and P. Walton. 2004. 'Snake Talks' in the classroom: Do they influence children's attitudes? Herpetological Review 35(4):338-341.
- Hanauska-Brown, L., B.A. Maxell, A. Petersen, and S. Story. 2014. Diversity Monitoring in Montana 2008 – 2010 Final Report. Montana Fish, Wildlife & Parks. Helena, MT. 78 pp.
- Hansen, R.W. and C. Uptain. 1984. Charina bottae (rubber boa). Herpetological Review 15(4):114.
- Hendricks, P. 1997. Lee Metcalf National Wildlife Refuge preliminary amphibian and reptile investigations: 1996. Montana Natural Heritage Program, Helena, MT. 21 p.
- Hendricks, P. and J.D. Reichel. 1996. Amphibian and reptile survey of the Bitterroot National Forest: 1995. Montana Natural Heritage Program. Helena, MT. 95 p.
- Hoyer, R.F. and G.R. Stewart. 2000a. Biology of the rubber boa (Charina bottae), with emphasis on C.b. umbratica. Part I: Capture, size, sexual dimorphism, and reproduction. Journal of Herpetology 34(3): 348-354.
- Hoyer, R.F. and G.R. Stewart. 2000b. Biology of the rubber boa (Charina bottae), with emphasis on C.b. umbratica. Part II: Diet, antagonists, and predators. Journal of Herpetology 34(3): 354-360.
- Kaban, L.W. 1978. A comparative study of organ placement in Charina bottae and Lichanura roseofusca (Serpentes: Boidae). M.S. Thesis, California State University (Long Beach). 77 p.
- Klauber, L.M. 1943b. The subspecies of the rubber boa, Charina. Transactions of the San Diego Society of Natural History 10(7): 83-90.
- Kluge, A.G. 1993. Calabaria and the phylogeny of erycine snakes. Zoological Journal of the Linnean Society 107(4): 293-351.
- Kluge, A.G. 1993. Zoological Journal of the Linnean Society 107: 293-351.
- Koch, E.D. and C.R. Peterson. 1989. A preliminary survey of the distribution of amphibians and reptiles in Yellowstone National Park. pp. 47-49. In: Rare, sensitive and threatened species of the Greater Yellowstone Ecosystem, T.W. Clark, A.H. Harvey, R.D. Dorn, D.C. Genter, and C. Groves (eds.), Northern Rockies Conservation Cooperative , Montana Natural Heritage Program, The Nature Conservancy, and Mountain West Environmental Services. 153 p.
- Koch, E.D. and C.R. Peterson. 1995. Amphibians and reptiles of Yellowstone and Grand Teton national parks. University of Utah Press, Salt Lake City, UT. 188 p.
- Linder, A.D. 1963. Ophiophagy by the rubber boa. Herpetologica 19(2): 143.
- Macey, R.J. 1983. Charina bottae bottae (Pacific rubber boa). Food. Herpetological Review 14(1):19.
- Maxell, B.A. 2002a. Amphibian and aquatic reptile inventories in watersheds in the South and Middle Forks of the Flathead River drainage that contain lakes being considered for application of piscicides and subsequent stocking of west slope cutthroat trout. Report to the Region 1 Office of the U.S. Forest Service and the Montana Department of Fish, Wildlife, and Parks. Montana Cooperative Wildlife Research Unit and Wildlife Biology Program, University of Montana, Missoula, MT. 62 pp.
- Maxell, B.A., J.K. Werner, P. Hendricks, and D.L. Flath. 2003. Herpetology in Montana: a history, status summary, checklists, dichotomous keys, accounts for native, potentially native, and exotic species, and indexed bibliography. Society for Northwestern Vertebrate Biology, Northwest Fauna Number 5. Olympia, WA. 135 p.
- Michaels, S.J. 1985a. Candoia carinata (Solomon Island boa). Ophiophagy. Herpetological Review 16(2) 1985: 54.
- Michaels, S.J. 1985b. Orphiophagy in two captive boids, Eunectes murinus and Candoia carinata paulsoni. Bulletin of the Chicago Herpetological Society 20(1): 25-26.
- Northrop, Devine and Tarbell, Inc. 1995. Cabinet Gorge and Noxon Rapids Hydroelectric Developments, 1994 Wetland Mapping and Assessment Study, Volume I of II. 27 pp. plus appendices.
- Nussbaum, R.A. and R.F. Hoyer. 1974. Geographic variation and the validity of subspecies in the rubber boa, Charina bottae (Blainville). Northwest Science. 48:219-229.
- Ortenburger, A.I. 1921. An eastern record and note on Charina bottae (Blainville). Copeia 1921:84.
- Patla, D.A. 1998a. Amphibians and reptiles in the Old Faithful sewage treatment area. Report to Yellowstone Center for Resources, Yellowstone National Park. 10 September, 1998. Greater Yellowstone Ecosystem Amphibian Survey and Monitoring Program, Herpetology Laboratory, Department of Biological Sciences, Idaho State University, Pocatello, ID. 7 p.
- Patla, D.A. 1999a. Amphibians and reptiles along the grand loop road in Yellowstone National Park: Canyon Junction to Fishing Bridge Junction. December 11, 1999. Greater Yellowstone Ecosystem Amphibian Survey and Monitoring Program, Herpetology Laboratory, Department of Biological Sciences, Idaho State University, Pocatello, ID. 24 p.
- Patla, D.A. 1999b. Amphibians and reptiles of the Madison to Norris road improvement project area, Yellowstone National Park. 11 November, 1999. Greater Yellowstone Ecosystem Amphibian Survey and Monitoring Program, Herpetology Laboratory, Department of Biological Sciences, Idaho State University, Pocatello, ID. 17 p.
- Patla, D.A. and C.R. Peterson. 1996a. Amphibians and reptiles along the Grand Loop Highway in Yellowstone National Park: Tower Junction to Canyon Village. 24 February, 1996. Greater Yellowstone Ecosystem Amphibian Survey and Monitoring Program, Herpetology Laboratory, Department of Biological Sciences, Idaho State University, Pocatello, ID. 49 p.
- Peabody, R.B., A.J. Judith, E.D. Brodie, Jr. 1975. Intraspecific escape from ingestion of the rubber boa, Charina bottae. Journal of Herpetolica 9(2): 237.
- Peterson, C.R. and M.E. Dorcas. 1992. The use of automated data-acquisition techniques in monitoring amphibian and reptile populations. pp. 369-378. In: McCullough, D.R. & Barrett, R.H. [Eds]. Wildlife 2001: populations. Elsevier Applied Science, London & New York.
- Peterson, C.R., C.J. Askey, and D.A. Patla. 1993. Amphibians and reptiles along the Grand Loop and Fountain Freight Roads between Madison Junction and Biscuit Basin in Yellowstone National Park. 26 July, 1993. Greater Yellowstone Ecosystem Amphibian Survey and Monitoring Program, Herpetology Laboratory, Department of Biological Sciences, Idaho State University, Pocatello, ID. 45 p.
- Peterson, C.R., D.A. Patla, and S.R. Sullivan. 1995. Amphibians and reptiles along the Grand Loop Highway in Yellowstone National Park: Madison Junction to Norris Campground. 7 July, 1995. Greater Yellowstone Ecosystem Amphibian Survey and Monitoring Program, Herpetology Laboratory, Department of Biological Sciences, Idaho State University, Pocatello, ID. 64 p.
- Place, C.B., III. 1992. Meet the rubber boa. Montana Outdoors 23(5): 35-37.
- Pope, P.H. 1931. A new record for the rubber snake, Charina bottae. Yellowstone Nature Notes 8(9): 70.
- Rauscher, R.L. 1998. Amphibian and reptile survey on selected Montana Bureau of Reclamation impoundments. Montana Department of Fish, Wildlife and Parks, Nongame Program. Bozeman, MT. 24 pp.
- Rehak, I. 1986. Charina bottae in the terrarium. Akvarium Terarium 29(6): 31-32.
- Reichel, J. and D. Flath. 1995. Identification of Montana's amphibians and reptiles. Montana Outdoors 26(3):15-34.
- Reichel, J.D. 1997. Amphibian, reptile and northern bog lemming survey on the Rocky Mountain Front: 1996. Montana Natural Heritage Program, Helena, MT. 81 p.
- Rodgers, T. L. and W. L. Jellison. 1942. A collection of amphibians and reptiles from western Montana. Copeia (1):10-13.
- Rodríguez-Robles, J.A., G.R. Stewart, and T.J. Papenfuss. 2001. Mitochondrial DNA-based phylogeography of North American rubber boas, Charina bottae (Serpentes: Boidae). Molecular Phylogenetics and Evolution 18(2): 227-237.
- Roedel, M.D. and P. Hendricks. 1998. Amphibian and reptile survey on the Bureau of Land Management Lewistown District: 1995-1998. Montana Natural Heritage Program, Helena, MT. 53 p.
- Roedel, M.D. and P. Hendricks. 1998b. Amphibian and reptile inventory on the Headwaters and Dillon Resource Areas in conjunction with Red Rocks Lakes National Wildlife Refuge: 1996-1998. Montana Natural Heritage Program, Helena, MT. 46 p.
- Spiess, P. and M. Smith. 1998. The rubber boa Charina bottae. Reptile and Amphibian Magazine 56:26-29.
- St. John, A.D. 2002. Reptiles of the northwest: California to Alaska, Rockies to the coast. Lone Pine Publishing, Renton, WA. 272 p.
- Stebbins, R. C. 2003. A field guide to western reptiles and amphibians. 3rd Edition. Houghton Mifflin Company, Boston and New York. 533 p.
- Stewart, G.R. 1977. Charina, C. bottae. Catalogue of American Amphibians and Reptiles 205.1-205.2.
- Storm, R. M., and W. P. Leonard (eds.). 1995. Reptiles of Washington and Oregon. Seattle Audubon Society. Seattle, WA. 176 pp.
- Tanner, V.M. 1933. A study of the variation of the dorsal scale rows of Charina bottae (Blainville). Copeia 1933: 81-84.
- Tanner, V.M. and W. Tanner. 1939. Notes on Charina bottae in Utah; reproduction and distribution. Great Basin Naturalist 1(1): 27-30.
- Thompson, Richard W., Western Resource Dev. Corp., Boulder, CO., 1996, Wildlife baseline report for the Montana [Montanore] Project, Lincoln and Sanders counties, Montana. In Application for a Hard Rock Operating Permit and Proposed Plan of Operation, Montanore Project, Lincoln and Sanders Counties, Montana. Vol. 5. Stroiazzo, John. Noranda Minerals Corp., Libby, MT. Revised September 1996.
- Timken, R. No Date. Amphibians and reptiles of the Beaverhead National Forest. Western Montana College, Dillon, MT. 16 p.
- Turner, F.B. 1951. A checklist of the reptiles and amphibians of Yellowstone National Park with incidental notes. Yellowstone Nature Notes 25(3): 25-29.
- Turner, F.B. 1955. Reptiles and amphibians of Yellowstone National Park. Yellowstone Interpretive Series No. 5. Yellowstone Library and Museum Association. Yellowstone National Park, WY. 40 p.
- Van der Pols, J. 1988. Care, breeding and other things worth knowing about the rubber boa, Charina bottae bottae (Blainville). Litteratura Serpentium English Edition 8(6): 244-254, illustr.
- Van Heest, R.W. and J.A. Hay. 2000. Charina bottae (Rubber boa). Antipredator behavior. Herpetological Review 31(3): 177.
- Weaver, R.E. 2005. Charina bottae (rubber boa). Relative prey mass. Herpetological Review 36(2):189.
- Weisman, C.M. 1988. Morphometric and electrophoretic comparison between the Pacific rubber boa (Charina bottae bottae) and the southern rubber boa (Charina bottae umbratica). M.S. Thesis, California State Polytechnic University (Pomona). 44 p.
- Welp, L., W. Fertig, and G. Jones. 1998a. Ecological Evaluation of the Potential Tensleep Canyon Research Natural Area Within the Bighorn National Forest, Washakie County, Wyoming. Unpublished report prepared by the Wyoming Natural Diversity Database, Laramie, WY.
- Welp, L., W. Fertig, and G. Jones. 1998b. Ecological Evaluation of the Potential Tongue River Research Natural Area Within the Bighorn National Forest, Sheridan County, Wyoming. Unpublished report prepared by the Wyoming Natural Diversity Database, Laramie, WY.
- Werner, J.K. and J.D. Reichel. 1996. Amphibian and reptile monitoring/survey of the Kootenai National Forest: 1995. Montana Natural Heritage Program. Helena, MT. 115 pp.
- Werner, J.K. and J.D. Reichel. 1994. Amphibian and reptile survey of the Kootenai National Forest: 1994. Montana Natural Heritage Program. Helena, MT. 104 p.
- Werner, J.K. and T. Plummer. 1995. Amphibian and reptile survey of the Flathead Indian Reservation 1993-1994. Salish Kootenai College, Pablo, MT. 55 pp.
- Werner, J.K. and T. Plummer. 1995. Amphibian monitoring program on the Flathead Indian Reservation 1995. Salish Kootenai College, Pablo, MT. 46 p.
- Werner, J.K., B.A. Maxell, P. Hendricks and D.L. Flath. 2004. Amphibians and Reptiles of Montana. Mountain Press Publishing Company: Missoula, MT. 262 pp.
- Werner, J.K., T. Plummer, and J. Weaslehead. 1998. Amphibians and reptiles of the Flathead Indian Reservation. Intermountain Journal of Sciences 4(1-2): 33-49.
- Yeager, D.C. 1929. Reptiles of Yellowstone Park with notes on the Amphibia. Yellowstone Nature Notes. Yellowstone National Park Library, Mammoth, WY. 12 p.
- Zackheim, K. 1973. Exhibit H: Wildlife Study. In Ash Grove Cement Co. files.
- Additional Sources of Information Related to "Reptiles"