New Mexico whiptail

The New Mexico whiptail (Aspidoscelis neomexicanus) is a female-only species of lizard found in New Mexico and Arizona in the southwestern United States, and in Chihuahua in northern Mexico. It is the official state reptile of New Mexico. It is one of many lizard species known to be parthenogenetic. Individuals of the species can be created either through the hybridization of the little striped whiptail (A. inornatus) and the western whiptail (A. tigris), or through the parthenogenetic reproduction of an adult New Mexico whiptail.

The hybridization of these species prevents healthy males from forming, whereas males exist in one parent species (see Sexual differentiation). Parthenogenesis allows the all-female population to reproduce. This combination of interspecific hybridization and parthenogenesis exists as a reproductive strategy in several species of whiptail lizard within the genus Aspidoscelis to which the New Mexico whiptail belongs.

Description
The New Mexico whiptail grows from 16.5 to 23 cm in length, and is typically overall brown or black in color with seven pale yellow stripes from head to tail. Light colored spots often occur between the stripes. They have a white or pale blue underside, with a blue or blue-green colored throat. They are slender bodied, with a long tail that is more commonly blue-green in their infant stage, melding into the same spotted brown and yellow color as they age.

Behavior
Like most other whiptail lizards, the New Mexico whiptail is diurnal and insectivorous. They are wary, energetic, and fast moving, darting for cover if approached. They are found in a wide variety of semi-arid habitats, including grassland, rocky areas, shrubland, or mountainside woodlands. Reproduction occurs through parthenogenesis, with up to four unfertilized eggs being laid in mid summer, and hatching approximately eight weeks later.

The New Mexico whiptail lizard is a crossbreed of a western whiptail, which lives in the desert, and the little striped whiptail, which favors grasslands. The whiptail engages in mating behavior with other females of its own species, giving rise to the nickname "lesbian lizards". A common theory is that this behavior stimulates ovulation, as those that do not "mate" do not lay eggs.