Reptiles
Texas Blind Snake
Rena dulcis · also called Texas threadsnake, Texas blind snakes
A gardener turns over a shovel of soil and finds what looks like an unusually shiny earthworm wriggling free, only for a closer look to reveal tiny scales and a hint of a forked tongue — a Texas blind snake, surfaced from a life spent almost entirely out of sight.
Overview
The Texas blind snake, Rena dulcis, is a small, worm-like, burrowing snake native to grassland and desert habitat across Texas, the surrounding southern United States, and northern Mexico. Its functional blindness, specialised ant-and-termite diet, and documented relationship with nesting screech owls make it one of the more genuinely surprising reptiles in North America.
A snake that lives in ant colonies, not just near them
Rather than simply hunting ants and termites from the outside, the Texas blind snake burrows directly into their underground nests, spending most of its life surrounded by the very insects it feeds on.
Status
Least Concern — widespread and common across suitable grassland and desert habitat throughout Texas and northern Mexico.
Texas Blind Snake: common questions
Is the Texas blind snake actually blind?
Functionally, yes — it has only tiny, vestigial eyes capable of detecting light and dark rather than forming actual images, an adaptation well suited to a life spent almost entirely underground in total darkness, where true eyesight would offer little advantage.
Why do screech owls bring live Texas blind snakes into their nests?
Eastern screech owls have been documented carrying live Texas blind snakes back to the nest rather than eating them, where the snakes survive and feed on nest parasites, an unusual documented relationship that appears to benefit the health of the owl chicks.
What does a Texas blind snake eat?
This species feeds almost exclusively on ant and termite eggs, larvae, and pupae, raided directly from underground insect colonies, a specialised diet closely tied to its burrowing, underground lifestyle.
Could a Texas blind snake be mistaken for an earthworm?
Very easily — it has a slender, pinkish-brown, worm-like body covered in small, smooth, glossy scales, an appearance close enough to an earthworm that most people who happen to dig one up assume it is simply a large worm.