Reptiles
Great Plains Ratsnake
Pantherophis emoryi · also called Emory's rat snake
For years, herpetologists filed the Great Plains ratsnake away as simply a plainer regional cousin of the colourful corn snake, until closer genetic and physical study revealed enough real difference to grant it a fully separate identity of its own.
Overview
The Great Plains ratsnake, Pantherophis emoryi, is a non-venomous constrictor native to grassland, prairie, and desert scrub habitat across a broad range of the central United States and northern Mexico. Its history as a once-lumped corn snake subspecies, distinctive arrow-marked head, and broad tolerance for disturbed agricultural habitat make it one of the more taxonomically interesting and adaptable rat snakes on the continent.
A species redefined by closer study
What once passed as regional variation within the corn snake turned out, under closer genetic and physical examination, to be different enough to warrant the Great Plains ratsnake its own full species status entirely.
Status
Least Concern — widespread and stable across suitable grassland and desert habitat throughout the central United States and northern Mexico.
Great Plains Ratsnake: common questions
Why was the Great Plains ratsnake once considered part of the corn snake?
Early classifications grouped this species together with the corn snake as part of a single broader species complex, since the two shared overall body shape and general appearance, but later detailed study of genetics, scale counts, and specific colour pattern differences showed enough distinction to justify recognising the Great Plains ratsnake as its own fully separate species.
How can you identify a Great Plains ratsnake?
Look for a pale grey or tan body marked with a series of darker brown blotches running down the back, often paired with a distinctive dark, arrow-like or spearhead-shaped marking on top of the head, a combination of features that helps distinguish it from similarly patterned snakes sharing its central grassland and desert range.
Is the Great Plains ratsnake dangerous to people?
No, this species is entirely non-venomous and kills its prey exclusively through constriction, posing no real danger to people beyond a possible defensive bite if handled or cornered, a response considerably less serious than that of the venomous species it is sometimes mistaken for.
Can the Great Plains ratsnake live near farms and towns?
Yes, this species tolerates a range of disturbed habitat conditions, including agricultural land and areas near human development, provided there is still sufficient rodent prey and adequate shelter available, an adaptability that has helped it remain common across much of its broad central range.