Description: English: A large blotched ensatina (Ensatina eschscholtzii klauberi, top) and a Monterey ensatina (E. e. eschscholtzii, below), populations of the same species that do not interbreed, but grade into other populations of the same species, forming a ring species. From the files File:Ensatina eschscholtzii klauberi.jpg and File:Ensatina eschscholtzii e.jpg, both public domain files. Source: Own work. Author: Petter Bøckman.