How to Identify Graham's Crayfish Snake (Identification Guide)
A slender, semi-aquatic tan to olive snake with a bold pale stripe low on each side and a cream to yellowish belly.
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Key identifying features
Graham's crayfish snake (Regina grahamii) is identified by its slender build, olive to tan-brown dorsal coloration, and a well-defined pale yellow to cream stripe running along the lower side of the body on the third and fourth scale rows. The plain unmarked back combined with this lateral stripe and a crayfish-associated aquatic habitat helps distinguish it.
Coloration & pattern
The back is a fairly uniform olive, tan, or grayish-brown, sometimes with faint darker striping barely visible. A distinct pale cream or yellowish stripe runs along each side of the body low on the flanks, similar in placement to the queen snake's lateral stripe. The belly is plain cream to pale yellow, generally lacking the bold dark spotting seen in some related species, sometimes with a faint gray or dusky central line.
Head, eyes & scales
The head is narrow and blends smoothly into the neck, colored like the body without strong facial markings. Eyes are moderate sized with round pupils. Dorsal scales are keeled, typical of natricine water snakes, giving a slightly rough feel.
Size & body shape
Adults commonly reach 45 to 76 cm (18 to 30 inches), making this one of the larger crayfish-eating natricines, with a slender, elongated body suited for foraging in water and mud.
Range & habitat where you'll see it
This species ranges through the central United States, including Texas, Oklahoma, Kansas, Missouri, and neighboring states, inhabiting slow streams, ponds, marshes, and ditches with abundant crayfish burrows. It is highly aquatic and often found near water's edge, under rocks or debris, or basking on banks close to the water.
How to tell it apart from look-alikes
The queen snake is very similar in shape and stripe pattern but the belly of Graham's crayfish snake is generally more plain cream without the four dark longitudinal stripes seen in queen snakes. Common watersnakes are bulkier with blotched or banded patterns rather than a single clean lateral stripe. Garter snakes usually have three stripes along the top and sides of the back rather than one low lateral stripe. The plain back paired with a single low-set pale stripe and association with crayfish-rich waters helps confirm this species.
Frequently asked questions
What is the key field mark for Graham's crayfish snake?
A pale cream to yellow stripe running low along each side of an otherwise plain olive-brown to tan body.
How can you tell it apart from a queen snake?
Graham's crayfish snake typically has a plainer, unstriped cream belly, while the queen snake's belly shows four dark longitudinal stripes.
Is Graham's crayfish snake venomous?
No, it is a harmless, non-venomous species.
What habitat does this snake prefer?
Slow-moving streams, ponds, and marshes with abundant crayfish burrows across the central United States.
What does this snake primarily eat that relates to its name?
Crayfish, which it hunts in and near shallow water and burrows.