Keywords: Nerodia-rhombifer-02.jpg Diamondback watersnake Nerodia rhombifer JIM CONRAD'S NATURALIST NEWSLETTER Written and issued at the woods edge near Natchez Mississippi http //www backyardnature net/n/08/080616 htm http //www backyardnature net/n/08/080616ek jpg 2008-06-16 Jim Conrad Jim Conrad See http //www backyardnature net/j/copyrite htm original upload log wikitable date/time username resolution size edit summary ---- 07 49 15 November 2008 User Eug <a href http //upload wikimedia org/wikipedia/commons/2/26/Elaphe_obsoleta_spiloides-head jpg ><img alt Thumbnail for version as of 07 49 15 November 2008 src http //upload wikimedia org/wikipedia/commons/thumb/2/26/Elaphe_obsoleta_spiloides-head jpg/120px-Elaphe_obsoleta_spiloides-head jpg width 120 height 95 border 0 /></a></td><td>550×436 22 KB <nowiki> Summary Head of a Gray Rat Snake Elaphe obsoleta ssp spiloides It can be distinguished from a venomous pit-viper by its round pupils pit-vipers have cat-eyed ones and by the absence of a pit between the eye and</nowiki> Nerodia rhombifer Nerodia heads |