Southern Rubber Boa vs. Northern Rubber Boa

The owner's pair. Split on genetics; in the field only range separates them. A: Southern California mountains only: San Bernardino, San Jacinto, Mt. Pinos and the Tehachapi Mountains in the Southern Rubber Boa; the Sierra Nevada, Cascades, Coast Ranges, Pacific Northwest and Great Basin, north and west of the deserts in the Northern Rubber Boa. Separated by about 300 miles of desert and lowland; they never meet.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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