Western Rat Snake
Pantherophis obsoletus • Squamata; Serpentes; Colubridae; Colubrinae; Pantherophis; Pantherophis obsoletus
Central North America, ranging from the Gulf Coast of Texas and Louisiana north through the central United States to Iowa and parts of Minnesota and Wisconsin, and west to Kansas and Oklahoma.
Look up Western Rat Snake in the Snake Encyclopedia →Venomous Status
Non-venomous
Danger Level
Harmless - poses no threat to humans; provides beneficial pest control by eating rodents.
Family
Squamata; Serpentes; Colubridae; Colubrinae; Pantherophis; Pantherophis obsoletus
Conservation
Least Concern (IUCN). Populations are generally stable across their range, though habitat fragmentation and road mortality are localized threats.
Physical Description
Dark brown to black dorsal ground color with lighter colored blotches (white, cream, or yellow) creating a patterned look. Scales are weakly keeled. Head is wider than the neck, and the eyes have round pupils. The venter (belly) is typically light with checkerboard patterning.
Size & Dimensions
The specimen in the photo appears to be an adult of approximately 4-5 feet. Species typical range is 3.5 to 6 feet, with record lengths exceeding 8 feet.
Habitat
Extremely versatile; found in hardwood forests, rocky timbered hillsides, river floodplains, and swamps. Known for frequenting barns and abandoned buildings, often climbing into rafters and trees.
Behavior & Temperament
Known for being excellent climbers (semi-arboreal). They are generally docile but may rattle their tails in leaves to mimic a rattlesnake, musk, or strike if cornered. Primarily diurnal, but often crepuscular or nocturnal during hot summer months.
Diet & Feeding
Active foragers that primarily consume rodents, birds, and eggs. They are powerful constrictors, using their muscular bodies to suffocate prey before ingestion.
Reproduction
Oviparous (egg-laying). Females lay clutches of 10 to 30 eggs in late spring or early summer, typically in rotting logs or leaf mulch. Eggs hatch in late summer.
Venom Profile
Non-venomous - no medically significant venom.
Look-alikes
Often confused with the Timber Rattlesnake (which has a rattle, vertical pupils, and heat pits) or the North American Racer (which has smooth scales and lacks the distinct blotched pattern).
Conservation Status
Least Concern (IUCN). Populations are generally stable across their range, though habitat fragmentation and road mortality are localized threats.
Cultural Significance
Highly valued by farmers and homeowners for their ability to control rodent populations. They are frequent subjects of 'snake in the rafters' stories due to their climbing ability.
Notable Features
Remarkable climbing ability evidenced by the 'crinkled' or 'kinked' body posture often used to maintain grip on vertical surfaces or rafters, as seen in the submitted image.