Owl that eats rock pocket mouse5/29/2023 ![]() merriami is smooth and silky, and when pressed down may be oily in appearance. For example, in Coahuila, Mexico an average difference of 0.9 grams between males and females has been reported. Within Texas, for example, this species is smallest in the south, moderate in size in the west, and the largest in north. Average weight and size varies depending on geographic region. Merriam’s pocket mice are small heteromyid rodents whose weight and length (including body and tail) averages from 7 to 10 grams and 113.9 to 116.4 mm, respectively. ( Best and Skupski, 1994 Chapman and Packard, 1974) ![]() Merriam’s pocket mice appear to have no preference for soil type within its geographic range, residing in areas of clay, caliche, and sand. In western regions, they inhabit desert scrubland characterized by rocky soil and limited vegetation. In central and southern Texas they live in shortgrass or heavily grazed pasture dominated by mesquite ( Prosopis glandulosa). Merriam’s pocket mice inhabit several different vegetation and habitat types throughout their range. ( Best and Skupski, 1994 Linzey, et al., 2008 Schmidly, 2004) Merriam’s pocket mouse does not extend eastward past the western two-thirds of the state of Texas. Perognathus merriami (Merriam’s pocket mouse) currently occupies a geographic range extending from the plains of northern Texas and western Oklahoma, westward to eastern New Mexico, and south through western and southern Texas into the Mexican states of Chihuahua, Nuevo Leon, Tamaulipas, and Coahuila.
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