. Montana amphibian and reptile status assessment, literature review, and conservation plan. Amphibians; Reptiles; Indicators (Biology); Habitat (Ecology); Wildlife conservation. Western Hog-nosed Snake {Heterodon nasicus) Up-to-date distribution and status information can be found on the Montana Natural Heritage Program's TRACKER website at Distribution/Taxonomy The Western Hog-nosed Snake is primarily found in the northern Great Plains, ranging from southern Alberta southward along to northeastern New Mexico and northern Oklahoma, and northeasterly to Illinois, Wisconsin, and nort
. Montana amphibian and reptile status assessment, literature review, and conservation plan. Amphibians; Reptiles; Indicators (Biology); Habitat (Ecology); Wildlife conservation. Western Hog-nosed Snake {Heterodon nasicus) Up-to-date distribution and status information can be found on the Montana Natural Heritage Program's TRACKER website at Distribution/Taxonomy The Western Hog-nosed Snake is primarily found in the northern Great Plains, ranging from southern Alberta southward along to northeastern New Mexico and northern Oklahoma, and northeasterly to Illinois, Wisconsin, and northwestern Indiana, and northwesterly to southern Manitoba (Ernst and Ernst 2003). Of the three subspecies of Western Hog-nosed Snake found in North America the subspecies that occurs in Montana is Heterodon nasicus nasicus. The remaining two subspecies occur well to the south of Montana from southwestern New Mexico south into Mexico and in Missouri. H. n. nasicus is distributed primarily along the major river corridors in the Great Plains region of eastern and north-central Montana (Werner et al. 2004). In Montana, there are about 58 records from 28 counties east of the Continental Divide. Maximum Elevation 1,286 m (4220 ft) in Cascade County (Gerald Painter, pers. com., MTNHP 2007). Identification Juveniles and Adults: The Western Hog-nosed Snake is a stout, heavy bodied species with a snout that is upturned much like a digging spade or trowel. The dorsal scales are keeled with 23 or fewer rows of dorsal scales at midbody (Hammerson 1999). The underside of the tail is primarily black and the prefrontal scales are separated by small scales. Total length for males in Kansas averages 55 cm and 65 cm for females. Maximum TL is 154 cm (Ernst and Ernst 2003). Males typically have 35 or more grayish brown, deep cinnamon, or chocolate brown blotches along mid dorsal line between head and vent while females may have greater than 40 blotches (Walley and Eckerman 1999, Hammerson 1999). Th
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