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The giant garter snake is one of the largest garter snakes, reaching a length of 63.7 inches (162 centimeters). The snake is olive to brown with a cream, yellow or orange stripe running down its back, and two light colored stripes running along each side.
U.S.FWS Species profile about species listing status, federal register publications, recovery, critical habitat, conservation planning, petitions, and life history.
Geographical Range: Endemic to California. Historically, this snake ranged from Kern County north along the Central Valley to Butte County, with a gap in the central part of the valley.
Giant Garter Snake (Thamnophis gigas) Dorsal background coloration (the basic color on the snake's back) varies from brownish to olive with a checkered pattern of black spots, separated by a yellow dorsal stripe and two light colored lateral stripes.
Giant gartersnakes currently range from Butte County to Fresno County, although few populations remain in the southern portion of their range (Fig. 1; Hansen and Brode 1980; Ernst and Ernst 2003; Wylie and Amarello 2006).
Range maps are based on curated specimens and provided gratis by CNAH. (Created by Travis W. Taggart; Version: 2023.04.10.13.42.10) Download GeoJSON polygon range file: - 1 MB. First instance (s) of published English names: Giant Garter Snake (Thamnophis ordinoides gigas: Schmidt, Karl Peterson and D. D. Davis. 1941.
Giant Gartersnake Range - CWHR R079 [ds599] Range maps of California's regularly-occurring vertebrates were digitized as GIS layers to support the predictions of the CWHR System software, which allows users to query for wildlife species meeting a set of location and habitat conditions.
This dataset represents a species known range extent for Thamnophis gigas (Giant Gartersnake). These range maps are created by attributing sub-watershed polygons with information of a species presence, origin, seasonal and reproductive use.
Giant garter snakes often reach 1.2 m (4 ft) or more in length. They may be recognized by well-separated spots on the dorsal surface, a dull yellow, cream or orange dorsal stripe and olive-brown, cream orange or pale blue coloration on the ventral surface.
CWHR contains information on life history, management status, geographic distribution, and habitat relationships for wildlife species known to occur regularly in California. Range maps represent the maximum, current geographic extent of each species within California.