Which regions define the southernmost entry point into the United States for the Mexican Hognose Snake (H. n. kennerlyi)?

Answer

Extreme southern Rio Grande Valley, southeastern Arizona, and southwestern New Mexico

The Mexican Hognose Snake (*H. n. kennerlyi*) represents the southernmost population cluster, with its primary range extending from central San Luis Potosí and Tamaulipas in Mexico. When this subspecies moves northward into the United States, its entry points are geographically specific, primarily following the border regions influenced by the Sierra Madre Occidental. The confirmed ingress areas into the US include the extreme southern Rio Grande Valley, southeastern Arizona, and southwestern New Mexico. This contrasts sharply with the range of *H. n. nasicus*, which extends much further north into the core Great Plains, and *H. n. gloydi*, which occupies the southeastern interior states like Missouri and eastern Oklahoma.

Which regions define the southernmost entry point into the United States for the Mexican Hognose Snake (*H. n. kennerlyi*)?

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location reptile snake western hognose snake