Photo 170836, (c) Cullen Hanks, some rights reserved (CC BY-NC), uploaded by Cullen Hanks

Attribution © Cullen Hanks some rights reserved Uploaded by cullen Source iNaturalist Associated observations Photos / Sounds 3 photos What Mexican Black-tailed Rattlesnake (Crotalus molossus ssp. nigrescens) Observer cullen Date September 1, 2008 Place San Luis Potosí, MX (Google, OSM) Date Added September 5, 2012 08:16 PM EDT Description Snake was very high in elevation, up above Real de Catorce, Mexico. 9 IDs Research Grade View Sizes small medium large original