Gila Spotted Whiptail Cnemidophorus flagellicaudus
Sonoran Spotted Whiptail Cnemidophorus sonorae
Body length: 2 1/2 - 3 3/4"
Diet: Termites, spiders, and other arthropods
These two whiptail species share an uncommon trait: parthenogenesis, or development of the young from unfertilized eggs. There are no males in either species - only females! Scientists are still not sure how these all-female whiptails originated, and how a number of separate but very similar species are related.
Although many naturalists have trouble distinguishing species of whiptails, even experts struggle when it comes to separating these two. Both species are about the same size and live in similar rocky grassland habitats (such as below the Upper Cliff Dwelling). Both have stripes running the length of their tails and bodies. The differences are subtle, but as a general rule Gila spotted whiptails have spots within the pale stripes, while Sonoran spotted whiptails do not.