Western Rat Snake (also known as Black Rat Snake or Texas Rat Snake)
Pantherophis obsoletus • Order: Squamata; Suborder: Serpentes; Family: Colubridae; Subfamily: Colubrinae; Genus: Pantherophis; Species: P. obsoletus
Central North America, ranging from the Gulf Coast of the United States and Mexico north to southern Canada, and from the Mississippi River west to the Rocky Mountains.
Look up Western Rat Snake (also known as Black Rat Snake or Texas Rat Snake) in the Snake Encyclopedia →Venomous Status
Non-venomous (aglyphous teeth)
Danger Level
Harmless; while they may bite defensively if cornered or handled roughly, they pose no significant medical risk to humans or pets.
Family
Order: Squamata; Suborder: Serpentes; Family: Colubridae; Subfamily: Colubrinae; Genus: Pantherophis; Species: P. obsoletus
Conservation
Least Concern (IUCN). Generally abundant, though they face threats from habitat loss and intentional killing due to being mistaken for venomous snakes.
Physical Description
Large, stocky body with weakly keeled scales. Coloration is highly variable; this specimen shows a 'blotched' pattern typical of juveniles or certain Western populations, with dark brown or black blotches on a greyish or tan background. The head is wider than the neck, and the eyes have round pupils.
Size & Dimensions
The specimen in the photo appears to be an adult around 4-5 feet long. The species typically ranges from 3 to 6 feet, with record lengths reaching nearly 8 feet.
Habitat
Extremely versatile, found in hardwood forests, swampy bottomlands, rocky hillsides, and farm fields. They are frequently found in and around human structures like barns and attics (as seen in the photo).
Behavior & Temperament
Known for being excellent climbers and active during the day (diurnal) or at night during hot weather. Temperament varies; they may 'rattle' their tail in dry leaves to mimic a rattlesnake or release a foul-smelling musk when threatened.
Diet & Feeding
Primarily feeds on rodents, birds, and bird eggs. They are powerful constrictors that often active-forage for nests in trees or buildings.
Reproduction
Oviparous (egg-laying). Females lay clutches of 10 to 30 eggs in mid-summer, which hatch in late summer or early autumn.
Venom Profile
Non-venomous - no medically significant venom.
Look-alikes
Commonly confused with the Diamondback Watersnake (Nerodia rhombifer) which has heavier keeled scales and a more aquatic habitat, or the Western Diamondback Rattlesnake, although rat snakes lack a rattle and have round pupils.
Conservation Status
Least Concern (IUCN). Generally abundant, though they face threats from habitat loss and intentional killing due to being mistaken for venomous snakes.
Cultural Significance
Highly valued by farmers for ecological pest control, as a single adult rat snake can consume dozens of rodents per year.
Notable Features
Rat snakes are famous for their seemingly impossible climbing abilities, often found scaled up flat vertical walls or rafters. Their 'kinked' body posture when resting (visible in the photo) is a common defensive camouflage tactic.