Western Ratsnake (also known as the Black Ratsnake or Texas Ratsnake)
Pantherophis obsoletus • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Colubrinae, Genus: Pantherophis, Species: P. obsoletus
Widespread throughout North America, specifically in the central United States from the Mississippi River west to the Rocky Mountains and south into northern Mexico.
Look up Western Ratsnake (also known as the Black Ratsnake or Texas Ratsnake) in the Snake Encyclopedia →Venomous Status
Non-venomous (Aglyphous)
Danger Level
Harmless. Though they can be defensive and bite if cornered or handled, they possess no venom and pose no significant threat to humans or pets.
Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Colubrinae, Genus: Pantherophis, Species: P. obsoletus
Conservation
Least Concern (IUCN). Generally common, though they face threats from habitat fragmentation and intentional killing by humans due to fear.
Physical Description
Variable coloration; adults can be black with faint patterns or grey with bold brown/black blotches. The specimen in the image shows a blotched pattern with a white/cream underside. Head is wider than the neck, eyes have round pupils, and dorsal scales are weakly keeled.
Size & Dimensions
The specimen pictured appears to be a juvenile or sub-adult, roughly 1.5 to 2.5 feet long. Adults typically reach 3.5 to 6 feet, with rare records exceeding 7 feet.
Habitat
Highly adaptable; found in hardwood forests, prairies, rocky canyons, agricultural areas, and suburban yards. They are excellent climbers (semi-arboreal) and often found in barns or trees.
Behavior & Temperament
Diurnal and crepuscular. They are known for 'kinking' their bodies when stationary and performing defensive displays such as tail vibrating (mimicking a rattlesnake) and striking with an open mouth when threatened, as seen in the image.
Diet & Feeding
Active foragers that consume rodents, birds, and eggs. They are powerful constrictors, using their muscular bodies to dispatch prey.
Reproduction
Oviparous (egg-laying). Females lay clutches of 10 to 20 eggs in the summer (June-July), which hatch in late summer or early fall.
Venom Profile
Non-venomous - no medically significant venom.
Look-alikes
Often confused with the Northern Water Snake (Nerodia sipedon) or the venomous Copperhead (Agkistrodon contortrix) due to blotched patterns, but distinguished by their round pupils and slender body shape.
Conservation Status
Least Concern (IUCN). Generally common, though they face threats from habitat fragmentation and intentional killing by humans due to fear.
Cultural Significance
Valued by farmers as powerful pest control ('barn snakes') for their ability to manage rodent populations. They play a vital role in maintaining the balance of local ecosystems.
Notable Features
The most notable feature in this image is the defensive 'gaping' posture. The snake opens its mouth wide to appear larger and more intimidating to perceived predators, a classic bluffing behavior of the genus Pantherophis.