How to Identify the Flat-Headed Snake (Identification Guide)
A tiny, plain tan burrowing snake identified by its flattened head and small, uniform body, easily mistaken for a worm.
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Key identifying features
The Flat-Headed Snake (Tantilla gracilis) is one of the smallest snake species in North America, identified by its diminutive size, plain tan to light brown coloration, and a distinctly flattened head that is only slightly wider than the neck, giving the species its name.
Coloration & pattern
The dorsal coloration is a uniform light tan, brown, or grayish-tan with no bold pattern, though the head is often slightly darker than the body, sometimes appearing as a subtle dark cap. The belly is pale pink to salmon in some individuals, similar in concept to other small fossorial snakes, though less vividly colored than species like worm snakes.
Head, eyes & scales
As the name implies, the head is notably flattened in profile and barely distinct from the neck, an adaptation for pushing through loose soil and leaf litter. Eyes are tiny and dark. Scales are smooth, contributing to a streamlined body suited for burrowing.
Size & body shape
This is an extremely small species, with adults typically measuring only 5 to 8 inches, rarely reaching 9 inches. The body is thin and worm-like, cylindrical throughout with minimal tapering, and the tail is short.
Range & habitat where you'll see it
The Flat-Headed Snake is found in the south-central United States, including Texas, Oklahoma, Kansas, Missouri, and parts of neighboring states, extending into Mexico. It lives under rocks, logs, and leaf litter in rocky hillsides, open woodlands, and grasslands, rarely surfacing in the open and most often found by turning over surface cover.
How to tell it apart from look-alikes
The Flat-Headed Snake's extremely small size and plain tan color can lead to confusion with earthworms or other tiny burrowing snakes such as worm snakes and black-headed snakes. It differs from worm snakes by lacking the glossy, dark, two-toned pink-and-brown coloration and by its flatter head shape. It differs from black-headed snakes, which have a solid black or dark cap covering the head and neck, whereas the Flat-Headed Snake's head is only subtly darker, not sharply capped.
Frequently asked questions
How small is the Flat-Headed Snake?
It is one of the smallest snakes in North America, typically only 5 to 8 inches long as an adult.
How is the Flat-Headed Snake different from a Black-Headed Snake?
The Black-Headed Snake has a sharply defined solid black or dark cap on its head and neck, while the Flat-Headed Snake's head is only subtly darker than its body, without a sharp cap.
What does the Flat-Headed Snake's head look like?
It is distinctly flattened and barely wider than the neck, an adaptation for burrowing through soil and leaf litter.
Where would I find a Flat-Headed Snake?
Under rocks, logs, and leaf litter in rocky hillsides, woodlands, and grasslands across the south-central United States.