Several non-venomous snakes look strikingly similar to kingsnakes, but the most famous lookalike relationship actually runs the other direction: kingsnakes themselves evolved to mimic the venomous coral snake. Milk snakes, scarlet snakes, and scarlet kingsnakes all share overlapping red, black, and white or yellow banding that makes them difficult to tell apart at a glance. Depending on where you live, you may also encounter dark-bodied snakes like black rat snakes that get confused with the eastern or black kingsnake. Knowing a few physical details makes sorting them out much easier.
Why So Many Snakes Look Alike
The resemblance between kingsnakes, milk snakes, and coral snakes isn’t a coincidence. It’s a survival strategy called Batesian mimicry, where a harmless species evolves to look like a dangerous one. Because coral snakes are highly venomous, predators learn to avoid anything with bright red, black, and yellow banding. Non-venomous species that developed similar coloring gained protection: a predator that mistakes a harmless mimic for a coral snake simply passes it by. The cost of skipping a meal is low compared to the cost of biting into a coral snake, so the disguise works remarkably well.
Milk Snakes and Scarlet Kingsnakes
Milk snakes are the most widespread kingsnake lookalikes, with a range stretching from Canada through the Midwest and eastern U.S. all the way to Mexico and Ecuador. Their red, black, and white bands closely resemble both coral snakes and other kingsnake species. The scarlet kingsnake, once classified as a milk snake subspecies, is a small, slender snake that grows 14 to 20 inches long with smooth scales and a small head. It’s common throughout the southeastern U.S., especially in the Coastal Plain of states like Georgia.
Both milk snakes and scarlet kingsnakes are completely harmless. Their banding typically encircles the entire body, wrapping around the belly, which is one way to distinguish them from the scarlet snake (more on that below). Eastern milk snakes tend to live in fields, woodlands, rocky outcrops, and agricultural areas, while scarlet kingsnakes prefer the warmer southeastern lowlands.
The Scarlet Snake
The scarlet snake is another red, black, and white banded species that gets confused with kingsnakes, but a couple of physical features set it apart. Scarlet snakes have elongated, pointed snouts, while scarlet kingsnakes have shorter, blunt snouts. The easiest tell is the belly: scarlet snakes have plain, light-colored undersides, while scarlet kingsnake banding wraps all the way around the body. Scarlet snakes are found across various habitats in the Southeast, including woodlands and sandy areas, so they overlap geographically with scarlet kingsnakes.
Dark-Bodied Snakes Confused With Kingsnakes
Not all kingsnake confusion involves colorful banding. The eastern kingsnake has a dark brown to black body with contrasting white-to-yellow bands or chain-like crosslines, and its smooth, glossy scales give it a polished appearance. The genus name “Lampropeltis” actually translates to “shining shield,” a reference to that distinctive sheen.
The black kingsnake takes this even further, with reduced banding that can leave some individuals almost entirely black with light speckling. Some adults are completely patternless. This makes them easy to confuse with black rat snakes, which are also large, dark, and common across much of the eastern U.S. The key difference is scale texture: both kingsnake species have smooth, glossy scales, while black rat snakes have lightly keeled (ridged) scales that give them a duller, less shiny appearance.
California Kingsnake Pattern Variations
West of the Rockies, the California kingsnake adds another layer of confusion because it comes in multiple color-and-pattern forms. Some have the typical black-and-white banding, but others display longitudinal stripes running the length of the body. These striped individuals can look similar to the California striped racer, a mostly black snake with two yellow stripes along each side. The kingsnake’s stockier build and glossy scales help distinguish it from the more slender, fast-moving racer.
The “Red Touches Yellow” Rhyme
You’ve probably heard some version of “Red on black, friend of Jack; red on yellow, kill a fellow.” The idea is simple: if red bands touch black bands, it’s a harmless mimic; if red bands touch yellow bands, it’s a venomous coral snake. This rhyme is reasonably reliable east of the Mississippi River, where the eastern coral snake lives alongside scarlet kingsnakes and milk snakes.
West of the Mississippi, however, the rhyme breaks down. Several small desert species, including ground snakes, sand snakes, and shovel-nosed snakes, display band arrangements that violate the pattern. These snakes rarely exceed 12 inches and coexist with the Arizona coral snake, which itself looks somewhat different from its eastern relative. If you live in the Southwest, relying on the rhyme alone for identification is not a safe approach.
Even in the Southeast, the rhyme has limits. Unusual color variations pop up in both coral snakes and their mimics, and a quick glance at a fast-moving snake doesn’t always give you a clear read on band order. Learning the overall body shape, head size, and scale texture of snakes in your specific area is more reliable than memorizing a single rule.
Quick Identification Tips
- Scale texture: Kingsnakes have smooth, glossy scales. Rat snakes and some other lookalikes have keeled scales with a rougher, duller finish.
- Snout shape: Scarlet kingsnakes have blunt snouts; scarlet snakes have elongated, pointed ones.
- Belly pattern: Kingsnake banding wraps around the entire body. Scarlet snakes have plain, light bellies with no banding underneath.
- Body build: Kingsnakes are stocky relative to their length. Racers and rat snakes tend to be more slender with longer tails.
- Head size: Coral snakes have small, rounded heads that blend into the body, similar to kingsnakes. This is why color pattern alone isn’t always enough to tell them apart.