The gray ratsnake or gray rat snake (''Pantherophis spiloides''), also commonly known as the central ratsnake, chicken snake, midland ratsnake, or pilot black snake, is a species of nonvenomous snake in the

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

Pantherophis ''Pantherophis'' is a genus of nonvenomous colubrid snakes endemic to central and eastern regions of North America. It consists of the North American ratsnakes, the foxsnakes, and the cornsnakes. The genus, which contains 10 recognized spec ...

'' in the subfamily

Colubrinae The Colubrinae are a subfamily of the family Colubridae of snakes. It includes numerous genera, and although taxonomic sources often disagree on the exact number, The Reptile Database lists 717 species in 92 genera as of September 2019. It is t ...

. The gray ratsnake is one of about ten species within the American ratsnake genus ''Pantherophis''.

Description

A medium to large serpent, the gray ratsnake typically reaches an adult size of total length (including tail); however, the record is for a captive specimen at the Ridley 4-H Center in Tennessee. Unlike other ''Pantherophis'', whose conspicuous juvenile pattern fades into adulthood, the gray ratsnake in the southern part of its range does not undergo drastic ontogenetic changes in color or markings. Instead, it retains the juvenile pattern of dark elongate

dorsal Dorsal (from Latin ''dorsum'' ‘back’) may refer to: * Dorsal (anatomy), an anatomical term of location referring to the back or upper side of an organism or parts of an organism * Dorsal, positioned on top of an aircraft's fuselage * Dorsal c ...

blotches separated by four, or more, pale gray body scales, a light gray crown with dark striping that forms an anteriorly facing spearpoint, and a solid band which covers the eyes and extends rearward to the posterior upper labial scales. However, in the northern part of its range it is black in adulthood, like '' P. alleghaniensis'' and '' P. obsoletus''. The venter is usually off-white or pale gray with darker irregular blotches, and a double row of black spots behind the divided anal plate of the vent. The dorsal scale rows around midbody are usually weakly keeled. Because the gray ratsnake shares its range with other members of its genus, hybrids of midlands x eastern ratsnakes are not uncommon.

Distribution and habitat

Native to North America, ''Pantherophis spiloides'' is commonly found in the forests of the eastern and central United States. It occurs relatively continuously throughout the major part of the eastern half of the United States, along the western edge of the

Appalachian Mountains The Appalachian Mountains, often called the Appalachians, (french: Appalaches), are a system of mountains in eastern to northeastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. They ...

, from southwestern

New England New England is a region comprising six states in the Northeastern United States: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It is bordered by the state of New York (state), New York to the west and by the Can ...

to the

Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United ...

, westward to the

Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it fl ...

, and northward from northern

Louisiana Louisiana , group=pronunciation (French: ''La Louisiane'') is a state in the Deep South and South Central regions of the United States. It is the 20th-smallest by area and the 25th most populous of the 50 U.S. states. Louisiana is borde ...

to southwestern

Wisconsin Wisconsin () is a state in the upper Midwestern United States. Wisconsin is the 25th-largest state by total area and the 20th-most populous. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake M ...

. In

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

, this species is known to occur in two disjunct regions of

southern Ontario Southern Ontario is a primary region of the province of Ontario, Canada, the other primary region being Northern Ontario. It is the most densely populated and southernmost region in Canada. The exact northern boundary of Southern Ontario is disp ...

: the

Carolinian forest The Carolinian forest refers to a life zone in eastern North America characterized primarily by the predominance of deciduous (broad-leaf) forest. The term "Carolinian", which is most commonly used in Canada, refers to the deciduous forests which ...

region along the north shore of

Lake Erie Lake Erie ( "eerie") is the fourth largest lake by surface area of the five Great Lakes in North America and the eleventh-largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also h ...

in the southwest, and the

Great Lakes The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes in the mid-east region of North America that connect to the Atlantic Ocean via the Saint Lawrence River. There are five lak ...

St. Lawrence Saint Lawrence or Laurence ( la, Laurentius, lit. " laurelled"; 31 December AD 225 – 10 August 258) was one of the seven deacons of the city of Rome under Pope Sixtus II who were martyred in the persecution of the Christians that the Roma ...

region in the southeast.

Habitat

An agile climber, the gray ratsnake is at home from the ground to the tree tops in many types of hardwood

forest A forest is an area of land dominated by trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' ...

and cypress stands, along tree-lined streams and fields, and even around barns and sheds in close proximity to people. Within its range, almost any environment rich in rodents, and vertical escape options, proves a suitable habitat for the gray ratsnake.

Diet and behavior

Diet

A scent-hunter and a powerful constrictor, ''P. spiloides'' feeds primarily on small mammals, birds, and bird eggs. Neonates and juveniles prefer a diet of frogs and lizards.

Behavior

When startled, the gray ratsnake, like other ratsnakes, stops and remains motionless with its body held in a series of wave-like kinks. The snake will also rattle its tail against whatever it is lying on, making an audible buzzing sound. The gray ratsnake will defend itself by raising its head and bluffing a strike. If handled, it will musk a victim by releasing the foul-smelling contents of its cloaca, and will bite if necessary. However, the gray ratsnake is less likely to bite than other members of its genus, and wounds from a bite rarely require more than a small bandage.

Reproduction

Breeding in ''P. spiloides'' takes place from April to July. Females reach sexual maturity at 7–9 years of age. They deposit 5 to 27 eggs around mid-summer, and the

hatchling In oviparous biology, a hatchling is a newly hatched fish, amphibian, reptile, or bird. A group of mammals called monotremes lay eggs, and their young are hatchlings as well. Fish Fish hatchlings generally do not receive parental care, similar to ...

s usually emerge in September.

Conservation status

The gray ratsnake is considered common across much of its range, but is listed as "of special concern" in

Michigan Michigan () is a U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest, upper Midwestern United States. With a population of nearly 10.12 million and an area of nearly , Michigan is the List of U.S. states and ...

and is also listed as rare in Wisconsin. The gray ratsnake is listed federally in Canada as "endangered" ( Carolinean population) and "threatened" ( Great Lakes – St. Lawrence population). In the state of

Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...

, all indigenous, nonvenomous snakes are illegal to kill or capture, and are considered to be in the custody of the

Georgia Department of Natural Resources The Georgia Department of Natural Resources (DNR) is an administrative agency of the U.S. state of Georgia. The agency has statewide responsibilities for managing and conserving Georgia’s natural, cultural, and historical resources, and has fiv ...

.Georgia Wildlife.org Keeping Georgia Wildlife as Pets
georgiawildlife.org Habitat destruction and road mortality are leading causes of decline.