Other common names
Eastern Rat Snake, Rat Snake, Chicken Snake, Yellow Ratsnake, Everglades Ratsnake
Most adult Eastern Ratsnakes are about 42-72 inches (106-183 cm) in total length. This species is variable in coloration, but juveniles are gray with dark blotches. In the Panhandle, juveniles and adults look alike. However, adults in the Florida peninsula can be yellow, orange, tan, or gray with four dark longitudinal stripes, while sometimes retaining the dark dorsal blotches found in juveniles.
Range in Florida
In Florida, Eastern Ratsnakes occur in the Panhandle east of the Apalachicola River and throughout the peninsula south to Key Largo. However, they do readily interbreed with Gray Ratsnakes (Pantherophis spiloides) in the Panhandle.
Assessment of risk to people and pets
Non-venomous. Eastern Ratsnakes are not dangerous to people or pets, but they will readily bite to defend themselves. These snakes are not aggressive and avoid direct contact with people and pets. Virtually all bites occur when the snakes are intentionally molested.
Comparison with other species
Gray Ratsnake (Pantherophis spiloides) Non-venomous Gray Ratsnakes look like juvenile Eastern Ratsnakes and are found west of the Apalachicola River.
Red Cornsnake (Pantherophis guttatus) Non-venomous Juvenile Red Cornsnakes are brownish-red with a black and white checkerboard patterned belly.
Most adult Eastern Ratsnakes are about 42-72 inches (106-183 cm) in total length, with a record length recorded of 101 inches (256.5 cm). This species is variable in coloration, but juveniles are gray with dark blotches and a sandy-gray belly with dark square blotches. In the Panhandle, juveniles and adults look alike. However, adults in the Florida peninsula can be yellow, orange, tan, or gray with four dark longitudinal stripes, while sometimes retaining the dark dorsal blotches found in juveniles. The tongue is mostly black. The scales are weakly keeled, and there are 25-27 dorsal scale rows at midbody. The pupil is round.
Eastern Ratsnakes are commonly found in pinelands, hardwood hammocks, cypress strands, swamps, marshes, prairies, and agricultural fields. Adults and juveniles of this species are often found in suburban neighborhoods where development encroaches into favorable habitats.
When approached, Eastern Ratsnakes may either flee for shelter or remain motionless to avoid detection. However, if they are cornered, both juveniles and adults will take an S-shaped posture and strike at the attacker while rapidly vibrating the tip of the tail, which produces a buzzing sound in leaf litter. If grabbed or pinned, they may bite the attacker. But these snakes typically calm down quickly if held. Nonetheless, these snakes are not aggressive, and striking is only used in defense as a last resort.
Eastern Ratsnakes commonly feed on lizards, frogs, rodents, and birds and their eggs. These snakes constrict larger prey with coils of their body, but they often swallow smaller prey alive.
In Florida, females lay around 4-44 white elongate eggs, which typically hatch between July and September. The eggs are often laid in moist areas such as rotting vegetation and rotting logs.
Eastern Ratsnakes are primarily nocturnal (active at night). They are both terrestrial and extremely good climbers. They are commonly found under rocks and logs, but they can also be found in trees coiled under bark, within knot holes, and within palm fronds.
Eastern Ratsnakes are extremely beneficial to people because they prey heavily on many species that are considered pests.
As its common name implies, these snakes feed voraciously on rodents. However, they will also eat chicken eggs and chicks, which is the source of one of their common names, “chicken snake”.
The names for species and past subspecies of ratsnakes within the “Pantherophis obsoletus” complex have changed many times over the last several years. However, the currently proposed names and relationships are not universally accepted, and they may continue to be tweaked as additional information is collected and analyzed.
County data coming soon.
If you have a new or interesting observation for this species, please email the herpetology staff at the Florida Museum.
Burbrink, F.T. 2001. Systematics of the eastern ratsnake complex (Elaphe obsoleta). Herpetological Monographs 15: 1-53.
Burbrink, F.T., R. Lawson, and J.B. Slowinski. 2000. Mitochondrial DNA phylogeography of the North American ratsnake (Elaphe obsoleta): a critique of the subspecies concept. Evolution 54: 2107-2114.
Ernst, C.H. and E.M. Ernst. 2003. Snakes of the United States and Canada. Smithsonian Institution Press, Washington, DC. 668 pp.
Krysko, K.L., K.M. Enge, and P.E. Moler. 2019. Amphibians and Reptiles of Florida. University of Florida Press, Gainesville, Florida. 706 pp.
Powell, R., R. Conant, and J.T. Collins. 2016. Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America. Fourth edition. Houghton Mifflin Harcourt Publishing Company, Boston and New York. xiv + 494 pp.
Share your observations
You can help scientists better understand the biology and distribution of this species by sharing your observations. Send photos or videos of interesting observations, along with associated information, by emailing the herpetology staff at the Florida Museum for documentation in the Museum’s Herpetology Master Database. You can also post your observations on iNaturalist.
Additional helpful information
Do you have snakes around your house? Learn how to safely co-exist with snakes.
Still have questions about snakes or identifications? Feel free to email the herpetology staff at the Florida Museum with your questions or feedback about this profile.
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