How to Identify the Copperbelly Water Snake (Identification Guide)

Key identifying features

The Copperbelly Water Snake (a subspecies of Nerodia erythrogaster) is identified by its plain dark dorsal coloration paired with a coppery-orange to reddish-brown belly, a combination that closely parallels its close relative the Redbelly Water Snake but with a somewhat more muted, copper-toned ventral color rather than a bright red-orange. This contrast between top and bottom coloration is the primary way to recognize the species.

Coloration & pattern

The back is typically solid dark brown, gray-black, or nearly black in adults, generally lacking strong blotching or banding, giving a smooth, uniform dorsal appearance. The belly ranges from a warm coppery-orange to a duller orange-brown, usually unpatterned or with only faint markings near the edges. Juveniles may retain some faint dorsal blotches that fade as the snake matures into the more uniformly dark adult coloration.

Head, eyes & scales

The head is moderately broad and only somewhat distinct from the thick neck, typical of the Nerodia group of water snakes. Eyes are round-pupiled and positioned toward the top of the head, an adaptation for spotting movement above the waterline while mostly submerged. Scales are keeled, giving the body a rough rather than glossy texture.

Size & body shape

Adults are large and heavy-bodied, often reaching 75 to 120 centimeters or more, with a thick, muscular build suited to life in and around water. The tail is moderately long relative to the body, and the overall proportions are stout rather than slender, distinguishing it from more slender terrestrial snakes in the same wetland habitats.

Range & habitat where you'll see it

The Copperbelly Water Snake occurs in the Midwestern United States, particularly around the Ohio and lower Great Lakes region, favoring shrub swamps, wetlands, and slow-moving or still bodies of water with abundant vegetation. It is highly aquatic, often seen basking near the water's edge or swimming in shallow, vegetated wetland habitats.

How to tell it apart from look-alikes

The Copperbelly Water Snake is very similar to the Redbelly Water Snake but is generally found further north and tends to show a more coppery, less vividly red belly tone. It can be told apart from the more heavily blotched Northern Water Snake by its plain, unpatterned dark back and consistently colored belly, rather than the blotchy pattern typical of that more widespread species.