U.S. The giant garter snake is the largest species of garter snake, with the adult snakes ranging from 94–165 cm (3.1–5.4 ft) in length. The largest garter snake in the world is Thamnophis gigas, the giant garter snake. The giant garter snake is among the largest snakes in North America. Investigations of Giant Garter Snakes in the Natomas Basin: 2001 Field Season. These shy snakes require pools of water to both hunt prey and escape predators. Unfortunately, giant garter snakes are threatened, with only five percent of their historical habitat remaining. In colder temperatures, the snake goes underground and becomes […] Garter snake is a common name for generally harmless, small to medium-sized snakes belonging to the genus Thamnophis. The Giant Garter Snake Recovery Team. Fitch (1940) described it as a new subspecies Thamnophis ordinoides Endemic to North and Central America, species in the genus Thamnophis can be found from the subarctic plains of Canada to Costa Rica.The common garter snake (Thamnophis sirtalis) is the state reptile of Massachusetts.Garter snakes vary in length … The giant garter snake is not dangerous to humans. The scaly skin color can be brown, black or olive with checkered pattern or yellowish stripes. - Garter snakes are among the most common snakes in North America. The giant garter snake is the largest species of garter snake, ranging from 36 - 65 inches in length. The neck is narrower than the head. This snake lives in wetlands of the Central Valley of California. Giant Garter Snake Amazing Facts When disturbed, the Giant Garter Snake emits a foul-smelling musk from its cloaca. Garter snakes have toxins in their saliva which can be deadly to their prey. The giant garter snake is one of North America's largest native snakes, reaching up to 64 inches in length and endemic to California's Central Valley, where it originally inhabited natural wetlands. As with many snakes, the female giant garter snakes tend to be longer and larger than the males. Since then, its taxonomic status has been revised several times (Ruthven 1908, Van Denburgh and Slevin 1918, Fitch 1940, 1948, Fox 1948) . USGS-BRD, Western Ecological Research Center Dixon Field Station The giant garter snake, Thamnophis gigas, is a threatened species endemic to California's Central Valley. Though their bite might produce an unpleasant reaction in … The 60 million-year old fossil measured up to 50 ft long, weighed 20 times the average person, and consumed a diet of crocodiles and giant tortoises. In fact, it is endemic to this area, found nowhere else in the world. Where is the Giant Garter Snake found? The giant garter snake was referred to the species Eutaenia hammondii by Cooper (1870) . Fish and Wildlife Service (1999) Glenn D. Wylie and Michael L. Casazza. We sampled 14 populations throughout the current geographic range of T. gigas and amplified 859 bp from the mitochondrial gene ND4 and one … It uses venom to help capture its prey, but that venom is harmless to people. Garter snakes are usually 23-30 inches long but have been know to grow up to 53 inches long. One of the scarier snake facts: Located in the Cerrejo mines of Colombia, the Titanoboa was the biggest snake fossil ever found. - Garter snakes colors vary from green to grey to almost black, but regardless of … DRAFT RECOVERY PLAN FOR THE GIANT GARTER SNAKE (Thamnopsis gigas). Distinct stripes can be seen on snakes at the northern end. We tested the hypothesis that current watershed boundaries have caused genetic differentiation among populations of T. gigas. 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