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Western whiptail
The western whiptail (''Aspidoscelis tigris'') is a small lizard that ranges throughout most of the southwestern United States and northern Mexico. Most of its populations appear stable, and is not listed as endangered in any of the states comprising its range. It lives in a wide variety of habitats, including deserts and semiarid shrubland, usually in areas with sparse vegetation; also woodland, open dry forest, and riparian growth. It lives in burrows. Major differences between this species and the checkered whiptail (''Aspidoscelis tesselata'') include the lack of enlarged scales anterior to the gular fold and the presence of enlarged antebatrachial scales. It was previously known under ''Cnemidophorus tigris'', until phylogenetic analyses concluded that the genus ''Cnemidophorus'' was polyphyletic. Since it does not migrate, a number of forms have developed in different regions, several of which have been given sub-specific names - for example the California whiptail, ''Aspidoscelis tigris munda''.
==Location and habitat==
The western whiptail is usually found throughout Southern Idaho through southern Arizona and into northern Sonora. In the northern parts of its range, the western whiptail usually emerge from hibernation in May, and most adults aestivate during the midsummer months, but in the south the animals are active from April through late August. The seasonal period of activity is therefore considerably shorter in the north. Daily periods of activity are of similar duration from north to south, although the time of emergence tends to be later in northern areas. They are found in desert regions that have moderate to limited amounts of vegetation such as sagebrush or shadscale (a species of evergreen shrub). Their habitats range from sand and gravel to hardpan and loess. Regardless of type, however, burrows seem to be an important component. Rocks on the other hand, don't seem to be necessary.〔McCoy, C. J. 1965. Life history and ecology of ''Cnemidophorus tigris septentrionalis''. Ph.D. thesis, University of Colorado, Boulder.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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