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
Commonly found throughout North America, specifically from the central United States (west of the Mississippi River) including Texas, Oklahoma, Kansas, and Nebraska, extending north into Iowa and South Dakota.
Look up Western Rat Snake (also known as Black Rat Snake or Texas Rat Snake) in the Snake Encyclopedia →Venomous Status
Non-venomous (Aglyphous dentition - no specialized fangs)
Danger Level
Harmless - They pose no threat to humans or pets. While they may bite if cornered or handled roughly, the bite is medically insignificant and usually results in minor scratches.
Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Colubrinae, Genus: Pantherophis, Species: P. obsoletus
Conservation
Least Concern (IUCN); however, like many snakes, they face threats from habitat loss and intentional killing by humans due to mistaken identity as venomous species.
Physical Description
This juvenile specimen shows a dark grey to black ground color with distinct lighter grey or white blotches. Adults often darken to nearly solid black in some regions. The head is slightly wider than the neck, and scales are weakly keeled. Pupils are round.
Size & Dimensions
The specimen in the image appears to be a juvenile approximately 12-18 inches long. Adults typically range from 3.5 to 6 feet (106-183 cm), with some reaching up to 8 feet.
Habitat
Generalists found in a variety of habitats including hardwood forests, wooded canyons, swamp edges, and rocky hillsides. They are highly adaptable to human environments, often frequenting barns, abandoned buildings, and suburban yards.
Behavior & Temperament
Known for being excellent climbers and active foragers. When threatened, they often 'kink' their bodies into a series of s-curves to break up their silhouette or vibrate their tails in dry leaves to mimic a rattlesnake. They are primarily diurnal but become crepuscular/nocturnal in hot summer months.
Diet & Feeding
Diet consists primarily of rodents, birds, and eggs. They are powerful constrictors that actively hunt their prey. They are ecologically beneficial for controlling pest populations.
Reproduction
Oviparous (egg-laying). Females typically lay 10 to 20 eggs in mid-summer inside hollow logs or compost piles; eggs hatch in late summer or early autumn.
Venom Profile
Non-venomous - no medically significant venom.
Look-alikes
Juveniles are often confused with North American Racers (Coluber constrictor) or Copperheads (Agkistrodon contortrix) due to their blotched patterns. They are distinguished from Copperheads by their round pupils and lack of heat-sensing pits.
Conservation Status
Least Concern (IUCN); however, like many snakes, they face threats from habitat loss and intentional killing by humans due to mistaken identity as venomous species.
Cultural Significance
Highly valued by farmers and homeowners for their role as 'pest controllers' due to their voracious appetite for mice and rats. They are a staple species in North American herpetological education.
Notable Features
Remarkable climbing ability; they are often found high in trees or scaling the vertical walls of brick buildings. They have a white or cream-colored chin and throat which remains visible even in very dark adults.