Greater short-horned lizard its close relative the pygmy short-horned lizard ("Phrynosoma douglasii" ), which has the same basic body type consisting of small pointed scales around the head and back. Until recent mitochondrial DNA evidence, "P. hernandesi" was considered to be the same species as "P. douglasii". They are now considered distinct species with the pygmy short-horned lizard ("P. douglasii" ) occupying the northwest portion of the United States and extreme southern British Columbia. When placed together the two are easily distinguished at full size, the pygmy short-horned lizard being much smaller. "P. hernandesi" is a highly variable species with different geographic populations
Texas toad water bodies for breeding include the Gulf Coast toad ("Incilius valliceps"), the green toad ("Anaxyrus debilis"), the Great Plains narrow-mouthed toad ("Gastrophryne olivacea") and Couch's spadefoot toad ("Scaphiopus couchii"). The Texas toad sometimes hybridizes with Woodhouse's toad ("Anaxyrus woodhousii") or the Great Plains toad ("Anaxyrus cognatus"). The Texas toad has a wide range and a large total population and is one of the most common toads in the southern United States. It is tolerant of changes in its habitat and is present in cultivated areas as well as grasslands and savannahs. No particular threats have been identified and the International