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Latin Name: Farancia erytrogramma
Species: Reptile
Conservation Status: S3 - Vulnerable
The Rainbow Snake is a large, heavy-bodied, nonvenomous snake renowned for its striking coloration. Adults can reach up to 5.5 feet in length. Their glossy, iridescent black scales are marked with three thin red stripes running the length of the body, a yellow stripe along each side, and a reddish belly bordered by rows of black spots. Like their close relatives, the mud snakes, rainbow snakes have small spines on their tails. Males and females differ slightly in size and head shape, with males typically being smaller.
Range & Habitat
Rainbow Snakes are found throughout the southeastern United States, ranging from Louisiana eastward to southern Florida and northward to southern Maryland. They primarily inhabit shallow, slow-moving freshwater habitats, including cypress swamps, marshes, streams, and wetlands with abundant vegetation. While occasionally found in brackish waters, they are most often associated with clean, flowing freshwater systems.
Diet
Adults feed almost exclusively on American eels, while juveniles eat small fish, salamanders, tadpoles, frogs, and worms. Their diet specialization on eels is unique among North American snakes.
Life History
Breeding occurs in late spring and summer. Males compete for mates by engaging in combat, and both sexes may have multiple partners in a season. Females lay 10–52 eggs, averaging around 20, in underground nests or rotting vegetation. After laying, the female incubates the eggs but provides no further care once they hatch. Young snakes are independent and reach sexual maturity in 2–3 years. Lifespan in the wild is not well documented, but related species live up to 19 years, suggesting a similar lifespan.
Significance
Rainbow Snakes are often considered the most beautiful snake of the southeastern U.S., admired by herpetologists and nature enthusiasts alike.
Threats & How You Can Help
Populations are threatened by wetland loss due to drainage and development, illegal collection for the pet trade, and pollution. To help protect rainbow snakes, avoid purchasing wild-caught reptiles, reduce pesticide use that contaminates wetlands, and support conservation organizations that protect aquatic habitats.