Occurrence of the Garter Snake, Thamnophis Sirtalis, in the Great Plains and Rocky Mountains
                        
                     
                                                         
                
                    Occurrence of the Garter Snake, Thamnophis Sirtalis, in the Great Plains and Rocky Mountains
                                            
                            by Fitch Henry S. (henry Sheldon)
                            
                                8 Nov, 2018                            
                            
                         
                                        
                                                                        The common garter snake (Thamnophis sirtalis) has by far the most extensive geographic range of any North American reptile, covering most of the continental United States from the Atlantic to the Pacific and from south of the Mexican boundary far nor
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                                                The common garter snake (Thamnophis sirtalis) has by far the most extensive geographic range of any North American reptile, covering most of the continental United States from the Atlantic to the Pacific and from south of the Mexican boundary far north into Canada and southeastern Alaska. Of the several recognized subspecies, the eastern T. s. sirtalis has the most extensive range, but that of T. s. parietalis in the region between the Mississippi River and the Rocky Mountains is almost as large. The more western T. s. fitchi occurring from the Oregon and California coasts east through the northern Great Basin, has the third largest range, while the far western subspecies pickeringi, concinnus, infernalis and tetrataenia, and the Texan T. s. annectens all have relatively small ranges. Less