Rat Snakes


Last updated: May 27, 2024
Verified by: AZ Animals Staff
© Eric Isselee/Shutterstock.com

Rat snakes are constrictors from the Colubridae family of snakes.


Rat Snakes Scientific Classification

Scientific Name

Read our Complete Guide to Classification of Animals.

Rat Snakes Conservation Status

Rat Snakes Facts

Rats, mice, birds, bird eggs, lizards
Main Prey
Rats and mice
Name Of Young
Group Behavior
  • Solitary
Fun Fact
Rat snakes are constrictors from the Colubridae family of snakes.
Biggest Threat
Vehicles on roads, human encroachment
Other Name(s)
Corn snake, rat snake, bush snake,
Gestation Period
2-3 months
Generally mellow, but some species are more aggressive.
Litter Size
Anywhere from 3-20 eggs
Dense rainforest jungles to arid deserts.
Diet for this Fish
  • Diurnal
  • or Nocturnal Depending on Region and Season
Number Of Species
Average Clutch Size
Nesting Location
Hollow logs, leaf litter

Rat Snakes Physical Characteristics

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Rat snakes live in a wide range of environments.

There are roughly 50 rat snake species spread across 15 genera; they’re non-venomous and helpful garden allies. You can find them in most parts of the Northern Hemisphere, and they come in a variety of colors and patterns. They’re all oviparous and lay eggs in hollow tree stumps and quiet corners full of leaf litter; they’re also not typically aggressive.

Like the Rhinoceros snake (G. boulengeri), some sport a bright green color and a rhino-like nose; others, like the Eastern fox snake (P gloydi), are more discreet; they sport a shield pattern on their backside. These varied and adaptable snakes live in a wide range of environments.

Rat snakes are terrific climbers. Most species spend a significant amount of time in trees, on the tops of buildings, and in and around the rafters looking for their next meal. The joke about these snakes in some areas is that it’s probably a rat snake if it got into a weird place.

Black Rat Snake, Animal Mouth, Animal Tongue, Animal Wildlife, Animals In The Wild

Rat snakes spend a significant amount of time in trees.


4 Amazing Facts About Rat Snakes

  • There are over 50 species, spread across most of the Northern Hemisphere.
  • Some species can exceed 9 feet long.
  • They get their name from their favorite prey: rats and mice.
  • New World species are more closely related to king snakes than they are to the Old World rat snake species.


corn snake wrapped around branch of tree

Rat snakes, like the corn snake, are active during the day and eat a variety of rodents.


These snakes are widespread; most areas of the Northern Hemisphere host at least a few of these snakes. They live in various habitats, including dense rainforests, semi-arid fields and farmland, and arid deserts. Rat snakes are regularly found in odd places, like the eaves of a roof or climbing up a brick wall. They are excellent climbers, and they often climb trees, fences, and other obstacles to get to their meals.

They’re active daytime (diurnal) hunters and eat a variety of rodents, including rats, mice, and even squirrels and chipmunks. Juveniles will sometimes eat lizards, but adults almost exclusively prefer warm-blooded prey.

Most rat snake species have adapted well to humans, and many are found on the hunt, slithering around the edges of homes and buildings.

Read here to find out about rat snakes in Florida. You can also read here to find out about three rat snakes in Georgia.

Scientific Name

Rat snakes are a large group of snakes from the suborder Colubrinae in the family ColubridaeColubridae is the largest family of snakes; its members make up approximately 75% of all snake species. Some species were reclassified from Elaphe to other genera in recent years, including PantherophisOrthiophisZamenis, and others.

Until the early 2000s, scientists lumped most of them into the Elaphe genus because they believed they were all closely related. However, when they did DNA analysis of several Old and New World species, they discovered it was more complicated than they realized. The Old and New World species aren’t all that closely related, and in fact, the New World rat snakes are more closely related to kingsnakes than the Old World rat snakes.

A California kingsnake in a defensive position is ready to attack

New World rat snakes are closely related to kingsnakes, such as this California Kingsnake.


It gets better – not all the groups that research and name reptiles agree. For example, in 2002, herpetologist Urs Tiger suggested renaming most North American species Pantherophis, the Global Biodiversity Information Facility (GBIF), and the Society for the Study of Amphibians and Reptiles (SSAR) agreed; they now recognize Pantherophis. However, International Commission on Zoological Nomenclature (ICZN) and the Convention on International Trade in Endangered Species (CITES) don’t appear to, but those things can and do change.


There are approximately 50 species of these harmless reptiles. The Old World species inhabit Europe & Asia, while the New World species inhabit the Americas. They’re primarily arboreal and have a wide variety of patterns – they can be blotchy or striped, or solid-colored. A few have long pointy noses, and some are multi-colored.

Old World Group

This group of rat snakes lives in most places in the Eurasian continent and into Southeast Asia.


Snakes in this genus inhabit areas of Southeast Asia. It includes:

  • Philippine rat snake (C. erythrurus)
  • Yellow-striped snake (C. flavolineatus)
  • Trinket snake (C. helena)
  • Copperhead rat snake (Cradiatus)
  • Indonesian rat snake (C. subradiatus)


This genus is widely distributed in the Northern Hemisphere:

Japanese Rat Snake is known for climbing high into trees and taking baby birds out of their nests.

Japanese Rat Snake is known for climbing high into trees and taking baby birds out of their nests.


  • Twin-spotted rat snake (E. bimaculata)
  • King rat snake (E. carinata)
  • Japanese rat snake (E. climacophora)
  • David’s rat snake (E. davidi)
  • Dione rat snake (E. dione)
  • Japanese four-lined rat snake (E. quadrivirgata)
  • Four-lined snake (E. quatuorlineata)
  • Red-backed rat snake (E. rufodorsata)
  • Eastern four-lined snake (E. automates)
  • Russian rat snake (E. schrenckii)


These snakes occur in Japan and China:

  • Japanese forest rat snake (E. conspicillatus)
  • China’s pearl-banded rat snake (E. perlacea)


These rat snakes inhabit areas of China, India, Southeast Asia, Malaysia, and Indonesia. This genus displays a wide variety of colors, and some sport a rhino-like horn on the tip of their nose.

Rhinoceros Snake on a tree branch

Rhino snakes are common in Southeast Asia, and have a horn-like projection from the tip of their nose.

©Eric Isselee/Shutterstock.com

  • Assam trinket snake (G. frenatum)
  • Celebes black-tailed rat snake (G. jansenii)
  • Red-tailed rat snake (G. oxycephalm)
  • Blue-eyed bush rat snake (G. coeruleum)
  • Rhinoceros snake (G. boulengeri)
  • Hainan rhinoceros snake (G. hainanense
  • Rainbow tree snake (G. margaritatum)
  • Green trinket snake (G. prasinum)

Oreocryptophis porphyracea

This is another Southeast Asian genus with one species.

  • Mountain rat snake (O. porphyracea)


These snakes inhabit China and Southeast Asia.

The body of the beauty rat snake ranges from yellowish-brown to an olive green hue, though the tail is darker than the head.

The body of the beauty rat snake ranges from yellowish-brown to an olive-green hue, though the tail is darker than the head.

©Blue Iris/Shutterstock.com

  • Cantor’s rat snake (O. cantoris)
  • Hodgson’s rat snake (O. hodgsoni)
  • Chinese beauty snake (O. taeniurus)
  • flower snake (O. moellendorffi)


This group is a Southeast Asian genus:

  • Keeled rat snake (P. carinata)
  • Sulawesi black racer (P. dipsas)
  • White-bellied rat snake (P. fusca)
  • Chinese rat snake (P. korros)
  • Oriental rat snake (P. mucosa)
  • Green rat snake (P. nigromarginata)Pdhumnades, and Pluzonensis


These snakes are bright green and range from 3 to 4 feet long. They inhabit areas of Burma, China, India, Malaysia, Thailand, and Vietnam.

Green Bush Snake

Green bush snakes are smaller than other rat snakes, only 3-4 feet long.

©Sibons photography/Shutterstock.com

  • Green bush snake (Rhadinophis prasinus)


Snakes in this genus inhabit Europe and the Middle East. Their genus name, Zamenis, comes from Greek and means angry. They tend to aggressively defend themselves, and some say they have a relatively short fuse.

  • Transcaucasian rat snake (Z. hohenackeri)
  • Italian Aesculapian rat snake (Z. longissimus)
  •  Italian Aesculapian rat snake (Zlineatus)
  • Persian rat snake (Zpersicus)
  • Ladder snake (Z. scalaris)
  • Leopard snake (Z. situla).

New World Group


The desert rat snakes inhabit areas of the Southwest United States and northern Mexico.

Baja California rat snake

Baja California rat snake is a rare snake that inhabits the arid areas of California.


  • Baja California rat snake (Brosaliae)
  • Trans-Pecos rat snake (B. subocularis)


The majority of snakes in the New World group are Pantherophis.


There are two Mexican species, and both inhabit Yucatan, but the yellow-red rat snake also occurs in Eastern Mexico, Belize, Guatemala, Honduras, and Nicaragua.

Eastern Rat Snake

Large adult Eastern black rat snake in defensive coiled posture on a road. When threatened, rat snakes will “rattle” their tail, fooling other animals into believing they are venomous.

©Mike Wilhelm/Shutterstock.com

  • Yellow-red rat snake (P. flavirufa)
  • Yucatan rat snake (P. phaescens)


This snake inhabits many western areas of Central America.

Green Rat Snake

The top of the head of the Green Rat Snake may be a darker shade of green, yellow, or yellow-green.


  • Green rat snake (S. triaspis)


Spilotes is a single-species genus, that occurs from Eastern Mexico into South America in southern Brazil, southeastern Paraguay, and northeastern Argentina.

  • Chicken, or yellow rat, snake (S. pullatus)


Haasiophis terrasanctus
Haasiophis terrasanctus, found in Israel, is one of the first “true” snakes and still has hind legs.

Fossil records show that snakes first appeared during the Cretaceous period – although they often retained their hind limbs. The earliest true snake fossils come from the marine simoliophiids, the first being Hassiophis terasanctus, dated between 112 – 94 million years ago.

Scientists believe that snakes descended from lizards. Pythons and boas, the most primitive snakes, have vestigial hind limbs and some have remnants of a pelvic girdle appearing as horny projections.

Many modern snakes originated during the Paleocene alongside the radiation of mammals that occurred after the extinction of non-avian dinosaurs. The expansion of grasslands in North America led to a major radiation of snakes. During the Miocene, the number of snake species increased with the first vipers and elapids and the diversification of Columbridae.

Population and Conservation

Trans-Pecos ratsnake

Trans-Pecos rat snakes are nocturnal snakes so are rarely seen, although when they are they are not usually aggressive.

©Rusty Dodson/Shutterstock.com

There are a few listed on IUCN Redlist as vulnerable or endangered, such as the cave racer (ETeniura) and pearl-banded rat snake in China (Eperlacea). Still, the IUCN Redlist says that most species have stable populations. However, many aren’t on the list because there isn’t enough information.

Predators and Threats

Many animals prey on rat snakes, including weasels, badgers, birds of prey, coyotes, and other snakes. Their main threat varies depending on where they live. Human encroachment can be an issue, but more often, it’s vehicle encounters and illegal harvesting of the snakes for the pet trade. In some areas, weather such as a hurricane is a threat because of the flooding caused by the storms.


Appearance & Description

These snakes are medium to large, sometimes very long, and somewhat slender. They are constrictors from the Colubridae family and kill their prey by grabbing onto it and suffocating it. They range in length from 3 feet to over 9 feet long, and their favorite pastime seems to be getting into odd positions that defy logic. For example, people routinely find a rat snake wedged into the grout lines of bricks as it makes its way from one place to another. They can’t grab onto the bricks as a lizard can, so they wedge themselves into cracks and crevices using their belly scales as leverage for movement.

Four-lined rat snake
Elaphe quatorlineata

– the four-lined rat snake occurs in Macedonia and Greece.


In most species, their heads are turtle-shaped, some have what looks like a ghost in the pattern on the tops of their heads, and many have a lighter background color with darker shield-shaped patterns down the length of their backs. Of course, not all have these features, but enough of them make identifying them easier.

Are they Dangerous?

These aren’t dangerous to humans. However, some snakes in the Old World group have very mild venom in their mouths that does not affect people or dogs; none of them have fangs to inject any venom. A few of the larger species can deliver a painful bite because they have strong jaws.

Sometimes rat snakes will get into chicken coops and eat the eggs and chicks, so some people aren’t excited about seeing one. They can get very long, so they sometimes look dangerous, but they’re harmless.

Behavior and Humans

Two juvenile corn snakes

Corn snakes

are one of the most popular pet snake species because they’re easy for beginners to handle.

©Blue Dog Studio/Shutterstock.com

Many species have adapted well to humans and hide out under houses, in attics, and around yards. Rat snakes are active daytime hunters. However, some are flexible, so they also hunt in the early evening and morning hours.

If you find one in your garage, there’s nothing to fear. Rat snakes are appropriately named; they eat rats and mice that cause damage. Unfortunately, they also eat chicken eggs and chicks if they can. They may also frighten you by poking their heads out from some crevice above your head.

If you startle one, it will rattle its tail against something to make some noise imitating a rattlesnake, and it may bite, but unless it’s a giant rat snake, it probably won’t hurt very much and will only need a little basic first aid.

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About the Author

Gail Baker Nelson is a writer at A-Z Animals where she focuses on reptiles and dogs. Gail has been writing for over a decade and uses her experience training her dogs and keeping toads, lizards, and snakes in her work. A resident of Texas, Gail loves working with her three dogs and caring for her cat, and pet ball python.

Rat Snakes FAQs (Frequently Asked Questions) 

Are rat snakes venomous?

They’re not dangerous to humans and are non-venomous. Some Old World rat snakes have a small amount of weak venom that doesn’t affect humans or dogs, but they have no fangs and cannot inject it.

How do rat snakes hunt?

Most rat snakes are primarily arboreal and cruise through the trees hunting for their prey.

Are rat snakes aggressive?

Not generally, but some people consider Old World rat snakes more cranky than New World rat snakes.

Where do rat snakes live?

They’re pretty widespread! Rat snakes inhabit most areas in the Northern Hemisphere.

What do rat snakes eat?

They’ll eat lizards, birds, and bird eggs, but most prefer mammals like rats and mice.

What are the key differences between a rat snake and a coachwhip snake?

Coachwhip snakes and rat snakes differ in size, speed, habitat, and appearance.

Thank you for reading! Have some feedback for us? Contact the AZ Animals editorial team.


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