Western Rat Snake (also known as the Texas Rat Snake or Black Rat Snake)
Pantherophis obsoletus • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Colubrinae, Genus: Pantherophis, Species: P. obsoletus
Central United States, ranging from the Gulf Coast of Louisiana and Texas north to southern Minnesota and west to the Great Plains.
Look up Western Rat Snake (also known as the Texas Rat Snake or Black Rat Snake) in the Snake Encyclopedia →Venomous Status
Non-venomous (aglyphous dentition lacking specialized fangs)
Danger Level
Harmless; while capable of biting if handled or cornered, they pose no significant health risk to humans beyond minor puncture wounds or localized secondary infection.
Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Colubrinae, Genus: Pantherophis, Species: P. obsoletus
Conservation
Least Concern (IUCN); however, they are often killed by humans due to confusion with venomous species.
Physical Description
Variable coloration consisting of a dark grey, brown, or black ground color with lighter, irregular blotches. Juveniles and sub-adults (like this specimen) have distinct patterning that often fades with age. The belly is usually white or yellowish with dark smudges. Head is wider than the neck with large eyes and round pupils. Scales are weakly keeled.
Size & Dimensions
Typical adult range is 106-183 cm (3.5-6 feet); can reach over 240 cm (8 feet). This specimen appears to be a smaller juvenile or sub-adult, likely under 90 cm (3 feet).
Habitat
Highly adaptable to diverse environments including hardwood forests, swamps, river bottomlands, rocky hillsides, and agricultural areas. Common in suburban settings near human dwellings.
Behavior & Temperament
Diurnal in spring/fall and nocturnal in summer. Known for being quite defensive when threatened; often 'rattles' its tail in dry leaves to mimic a rattlesnake. As seen in the image, they will perform a wide-mouthed 'gape' and strike repeatedly if they feel they cannot escape.
Diet & Feeding
Generalist carnivore and powerful constrictor. Preys on rodents, birds, eggs, and occasionally lizards or frogs. Known as excellent climbers that frequently raid bird nests.
Reproduction
Oviparous; females lay clutches of 10 to 30 eggs in early summer (June or July). Eggs hatch in late summer or early autumn.
Venom Profile
Non-venomous - no medically significant venom.
Look-alikes
Often confused with the North American Racer (Coluber constrictor), Bullsnakes (Pituophis catenifer), or various species of local venomous Copperheads or Timber Rattlesnakes due to their blotched pattern and defensive posturing.
Conservation Status
Least Concern (IUCN); however, they are often killed by humans due to confusion with venomous species.
Cultural Significance
Ecologically vital for natural pest control of rodent populations. Frequently encountered around barns and farms (giving them the 'Rat Snake' name), they are generally tolerated by knowledgeable homeowners for their utility.
Notable Features
Superb climbers with specialized ventral scales that provide traction on vertical surfaces like tree bark or brick walls. They exhibits a 'kinking' behavior when stationary to break up their visual outline.