The Desert Grassland Whiptail lizard (Aspidoscelis uniparens) is an all-female species. It was formerly placed in the genus Cnemidophorus. These reptiles reproduce by parthenogenesis; eggs undergo a chromosome doubling after meiosis and develop into lizards without being fertilized. However, ovulation is enhanced by female-female courtship and "mating" (pseudocopulation) rituals that resemble the behavior of closely related to species that reproduce sexually.[1][2][3] However, this claim has been disputed, as Collins and Pinch relate.[4]

The lizard lives in dry deserts from central Arizona to west Texas and south into Mexico.