Presence and global potential distribution of Crotalus aquilus in Zacatecas, Mexico. Insert includes a C. aquilus from Tlachichila in the municipality of Nochistlán de Mejía (photo provided by Juan Felipe Martínez Montoya). The occurrence records used as input for the models are symbolized with dots, new records found during post-modeling field work are symbolized with triangles and the potential distribution is shown with warmer colors (red) identifying high potential for predicted presence for the species.