Dozens of snake species worldwide burrow into the ground, ranging from tiny blind snakes that spend nearly their entire lives underground to heavy-bodied species that simply duck into existing tunnels for shelter. Some are true burrowers with specialized skulls and scales built for digging. Others are opportunists that take over rodent holes or slip beneath loose soil to hide, hunt, or survive winter.
True Burrowers: Blind Snakes and Worm Snakes
The most committed burrowing snakes belong to the families Typhlopidae (blind snakes) and Leptotyphlopidae (thread snakes or worm snakes). These are small, cylindrical snakes, typically between 15 and 75 centimeters long, that live almost entirely underground. Their bodies are stiff and tube-shaped, built to push through soil rather than slither across it. Each eye is covered by a large head scale, leaving them with only the ability to detect light and dark. They don’t bask in the sun like other snakes. Instead, they absorb heat directly from the warm soil around them.
Blind snakes eat ants, termites, and their larvae. Large individuals will enter the nests of bull-dog ants and feed on pupae. Stomach contents from various species have also turned up earthworms, grubs, weevils, and woodlice. These snakes locate prey entirely underground, following chemical trails through the soil to find insect colonies. If you’ve ever turned over a rock or a piece of old wood and found a small, shiny, worm-like snake, you almost certainly encountered a blind snake or thread snake.
Sand Boas: Ambush Hunters Beneath the Surface
Sand boas (genus Eryx and relatives) take a different approach. Rather than tunneling deep into the earth, they bury themselves in loose, sandy soil with just their eyes poking above the surface. Their eyes sit on top of their heads for exactly this reason. A pointed, shovel-like snout and keeled (ridged) scales help them push into shifting substrate quickly and protect them while buried.
From this hidden position, sand boas wait for a rodent, lizard, or frog to wander past. They detect approaching prey through ground vibrations. When something gets close enough, the snake strikes, often pulling the prey item beneath the surface to constrict and eat it. Sand boas are found across Africa, the Middle East, and parts of Asia, and several species are popular in the pet trade because of their manageable size and docile temperament.
Other Notable Burrowing Species
Several other groups of snakes are adapted for life underground, each filling a different ecological niche.
- Stiletto snakes (Atractaspis): Found across Africa and the Middle East, these venomous snakes have reinforced, pointed snouts and compact skulls designed for pushing through soil. Their fangs can stab sideways, which lets them envenomate prey even inside a narrow tunnel. They’re sometimes called “burrowing asps” or “side-stabbing snakes.”
- Shield-tailed snakes (Uropeltidae): Native to southern India and Sri Lanka, these fossorial snakes play a measurable role in their rainforest ecosystems by aerating soil, which benefits tree root systems.
- Coral snakes (Micrurus): The eastern coral snake and Texas coral snake in the United States are semi-fossorial, spending much of their time hidden under leaf litter, logs, or in loose soil. They’re venomous, with the classic red-yellow-black banding pattern.
- Hognose snakes (Heterodon): Common across North America, hognose snakes have upturned, shovel-shaped snouts they use to root through sandy soil. They dig to find toads (their primary prey) and to create nesting sites, though they aren’t as deeply fossorial as blind snakes.
How Burrowing Snakes Are Built for Digging
Snakes that burrow share a set of physical features that set them apart from surface-dwelling species. The most obvious is the head shape. Burrowing snakes tend to have narrow, wedge-shaped, or rounded heads with reinforced scales on the snout (called rostral scales). These scales act like the tip of a shovel, taking the brunt of friction as the snake pushes through dirt.
Beneath the surface, the skull tells a more detailed story. In fossorial species, the nasal bones are elongated and broadened compared to non-burrowing snakes, creating a much stronger connection between the snout and the rest of the skull. This “central rod design” transmits the force of digging from the snout tip backward through the skull without the bones shifting or separating. It’s essentially a battering ram architecture, where the entire front of the skull works as a single rigid unit. Burrowing snakes also tend to have smoother, more uniform scales and compact, muscular bodies that resist compression from the surrounding soil.
Why Snakes Go Underground
Burrowing serves three main purposes: temperature control, safety from predators, and access to food.
Underground temperatures are far more stable than surface conditions. Burrows stay cooler during hot days and warmer during cold nights, making them reliable thermal refuges. Snakes in temperate climates depend on this stability to survive winter. They retreat to underground chambers called hibernacula, sometimes descending a meter or more to reach depths below the frost line where groundwater keeps temperatures around 5 to 6°C even in the coldest months. Some species use abandoned crayfish burrows that extend over 100 centimeters deep. Others gather in rocky crevices or old rodent tunnel systems that reach similar depths.
Beyond temperature, burrows provide cover. A snake underground is invisible to hawks, coyotes, and other predators. And for species like blind snakes and stiletto snakes, the underground world is also where their food lives. Ant colonies, termite mounds, and burrowing invertebrates are all accessible without ever coming to the surface.
Digging Their Own vs. Moving In
Most snakes don’t actually excavate burrows from scratch. The majority of species that use underground spaces are occupying tunnels originally dug by rodents, crayfish, tortoises, or large insects. Snakes lack limbs and claws, which makes moving large volumes of soil difficult. What they can do is widen or extend existing passages using their heads, or push into loose, sandy, or leaf-littered soil where minimal excavation is needed.
The true excavators are the highly specialized fossorial species: blind snakes and thread snakes that clear and expand spaces in soil using rhythmic head and neck movements, and stiletto snakes whose reinforced skulls let them force through compacted ground. Sand boas don’t so much dig tunnels as “swim” into loose substrate, displacing sand laterally as they shimmy downward. Hognose snakes use their upturned snouts to flip soil aside in short bursts rather than creating long tunnels.
If you find a hole in your yard and suspect a snake, the hole itself was likely made by a rodent or other animal first. Snake-occupied holes tend to be simple, shallow, and lack the piled-up dirt you’d see at the entrance of a freshly dug chipmunk or gopher burrow.
Their Role in the Ecosystem
Burrowing snakes contribute to their ecosystems in ways that often go unnoticed. By moving through soil, fossorial species help with aeration, creating small channels that allow water and oxygen to reach plant roots. Shield-tailed snakes in Indian rainforests are specifically noted for this benefit. Underground predators like blind snakes also keep ant and termite populations in check, which can influence soil composition and plant health across a wide area. Because these snakes are small, secretive, and rarely seen, their ecological contributions are easy to overlook but surprisingly significant for the habitats they live in.