Common Garter Snake (Thamnophis sirtalis) lives in freshwater wetlands across North America. It feeds on earthworms & leeches. Its conservation status is Least Concern.
Fascinating facts about the Common Garter Snake
- The common garter snake usually measures about 55 cm in total length, and some individuals can reach up to 137 cm. Most individuals stay under 1.2 m (4 ft) long, which means the majority of adults are well below the maximum size recorded. This size range reflects the species' thin build and the fact that few grow over about 4 ft long. Their average body mass is 150 g, supporting a slender, agile form.
- Beyond a harmless bite, the garter snake can store toxins from poisonous amphibians in its own tissues, turning itself into a poisonous deterrent. Its mildly venomous saliva may be toxic to amphibians and small prey, while the retained amphibian poisons make the snake poisonous to potential predators. This dual use of toxicity helps it both subdue prey such as mice and defend itself against larger threats.
- Garter snakes living alongside toxic newts have evolved strong resistance to tetrodotoxin, a deadly neurotoxin. In areas where the newt Taricha granulosa occurs, snakes show the highest levels of resistance, whereas populations outside this range have the lowest. This geographic pattern demonstrates an evolutionary arms race, with resistance providing an advantage for acquiring newt prey but also carrying fitness costs.
- During spring, dozens of males swarm a single female in a chaotic "mating ball", sometimes with ten or more rivals pressing together. A few clever males even masquerade as females to lure rivals away, boosting their own chances to mate.
- The common garter snake holds the honour of being Massachusetts' official state reptile. It inhabits a broad swath of North America, from Florida's tip to the Northwest Territories.
Sources
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At a glance
RangeNorth America
HabitatFreshwater wetlands
DietEarthworms & leeches
About the Common Garter Snake
As the common garter snake slithers through the damp underbrush, its sleek, mottled form seems to blend seamlessly into the shadows, a testament to its remarkable adaptability in a world of predators and prey. With sinuous, almost fluid movements, it navigates the intricate network of grasses and wildflowers, its forked tongue darting in and out to taste the air, ever vigilant for the slightest hint of danger or opportunity. In this quiet, unassuming way, the garter snake weaves its way through the landscape, a humble yet resilient presence that belies its fascinating complexity.
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