Bobby & Laura,
At a first glance I thought you are singled
Bok, B., M. Berroneau, M. Yousefi, J. Nerz, F. Deschandol, M. Berroneau & L. Tiemann (2017): Sympatry of Pseudocerastes persicus and P. urarachnoides in the western Zagros Mountains, Iran -- Herpetology Notes, volume 10: 323-325