Overview
The Louisiana Pine Snake (Pituophis ruthveni) is one of the rarest, most secretive, and most endangered snakes in North America. Endemic to the fire-maintained longleaf pine savannas of Louisiana and Texas, this heavy-bodied, burrowing constrictor spends over 90% of its life underground, living in an obligate predator-prey relationship with pocket gophers inside deep sandy subterranean tunnel systems.
Biology and Physical Characteristics
Pituophis ruthveni features a stout, powerful body covered in keeled scales, colored yellowish-buff to light brown with bold dark brown or black blotches along its back that fade toward the tail. Its snout terminates in an enlarged, pointed rostral scale designed for burrowing through loose sand. Inside its epiglottis sits a specialized cartilage flap that produces a loud, resonant defensive hiss that sounds like escaping steam.
Behavior and Ecology
An obligate subterranean hunter, the Louisiana Pine Snake depends almost entirely on Baird’s pocket gophers (Geomys breviceps) for food and underground shelter. Entering pocket gopher burrows, the snake pins the powerful rodent against the earthen tunnel wall with its muscular body coils to asphyxiate it, then takes over the cool underground burrow as its permanent home.
Conservation and Human Impact
Classified as Endangered by the IUCN and Federally Threatened under the US Endangered Species Act, the Louisiana Pine Snake has suffered a catastrophic 90% range contraction due to the historic clearing of ancient longleaf pine forests for commercial timber and fire suppression that lets dense brush choke sandy savannah floors.
Interesting Factoid
The Louisiana Pine Snake spends over 90% of its life underground inside pocket gopher tunnels, producing the largest eggs and hatchlings relative to body size of any snake in North America.