Head to head
Giant Garter Snake vs Two-Striped Garter Snake
A giant garter snake and a two-striped garter snake are both California natives now classified as Vulnerable, each having lost most of its historical wetland habitat to development, drought, and water diversion, leaving both species dependent on whatever water remains.
| Giant Garter Snake | Two-Striped Garter Snake | |
|---|---|---|
| Scientific name | Thamnophis gigas | Thamnophis hammondii |
| Range | California's Central Valley | Southern California and northern Baja California |
| Size | Largest species in its genus | Moderate size |
| Pattern | Typical garter snake striping | Only two stripes, no middle stripe |
| Current stronghold habitat | Irrigation canals and rice fields | Remaining permanent streams and pools |
| Main threat | Historical wetland conversion to farmland | Drought, water diversion, invasive predators |
| Diet | Fish and amphibians | Fish and native amphibians |
| Conservation status | Vulnerable | Vulnerable |
Giant Garter Snake vs Two-Striped Garter Snake: common questions
Why are both of these garter snakes considered Vulnerable?
Both species have lost most of their historical wetland habitat — the giant garter snake to the conversion of over 90 percent of California's Central Valley marshland to farmland, and the two-striped garter snake to drought, water diversion, and development affecting the southern California streams it depends on, leaving both species reliant on a fraction of their original range.
How can you tell these two garter snakes apart by pattern?
The two-striped garter snake typically lacks the middle dorsal stripe common to most garter snakes, showing only two lateral stripes, while the giant garter snake displays a more typical garter snake striping pattern, with its identity instead set apart mainly by its considerably larger size.
Where does each of these snakes survive today?
The giant garter snake now survives largely within irrigation canals and rice fields that substitute for its lost native marshland, while the two-striped garter snake remains tied to whatever permanent streams and pools still persist in its southern California and Baja California range.