Black Rat Snake (or Central Ratsnake)
Pantherophis alleghaniensis (formerly Pantherophis obsoletus) • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Colubrinae, Genus: Pantherophis, Species: P. alleghaniensis
Eastern and central North America; from southern Ontario through the eastern United States to Florida and west to the Mississippi River.
Look up Black Rat Snake (or Central Ratsnake) in the Snake Encyclopedia →Venomous Status
Non-venomous; lacks fangs and venom glands.
Danger Level
Harmless; generally avoids confrontation with humans and poses no toxicological threat. May bite if handled roughly, but wounds are superficial.
Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Colubrinae, Genus: Pantherophis, Species: P. alleghaniensis
Conservation
Least Concern (IUCN). Though common, they face threats from habitat loss and intentional killing due to being mistaken for venomous species.
Physical Description
Large, heavy-bodied snake with a black dorsal coloration often showing faint white/gray between scales when stretched. The belly is usually white or yellowish with a checkerboard pattern. Head is relatively large and spear-shaped; eyes have round pupils; scales are weakly keeled.
Size & Dimensions
The specimen in the image appears to be an adult, approximately 4–5 feet (1.2–1.5 meters) long. Species range typically 3.5–6 feet (1–1.8 meters), with a record maximum of over 8 feet.
Habitat
Found in a variety of habitats including deciduous forests, fields, marshes, and suburban areas. Highly adaptable; frequently found in barns and abandoned buildings. Occurs from sea level to mountainous terrain.
Behavior & Temperament
Primarily diurnal but can be nocturnal in hot weather. Excellent climbers (semi-arboreal). When threatened, they may freeze, rattle their tail in leaves to mimic a rattlesnake, or release a foul-smelling musk.
Diet & Feeding
Active foragers that feed on rodents, birds, and eggs. They kill prey through constriction before swallowing it whole.
Reproduction
Oviparous (egg-laying). Females lay clutches of 6–24 eggs in rotting logs or leaf mulch during early summer, with hatchlings emerging in late summer/early autumn.
Venom Profile
Non-venomous - no medically significant venom.
Look-alikes
North American Racer (Coluber constrictor), which has smooth scales and is more slender; and Timber Rattlesnake (Crotalus horridus), which has a vertical pupil and rattle.
Conservation Status
Least Concern (IUCN). Though common, they face threats from habitat loss and intentional killing due to being mistaken for venomous species.
Cultural Significance
Important ecological role as a natural form of pest control, significantly reducing rodent populations around farms and homes.
Notable Features
Remarkable climbing ability; often found high in trees raiding bird nests. They are known for 'kinking' their bodies when resting to break up their silhouette for camouflage.