Aspidoscelis burti
A large, reddish whiptail in southeastern Arizona. Unlike most whiptails, they are sexually dimorphic: females and young males are striped, with indistinct spotting; adult males are prominently spotted, without distinct stripes.
A subadult or female in the Atascosa Mountains, Santa Cruz County, Arizona, 7 Aug 2005.
A juvenile in the Santa Rita Mountains, Santa Cruz County, Arizona, 26 Apr 2008.