* Found in most of North America.

* It is found in nearly every dry-land habitat (grassland, forest) within its range. Population is 10 to 15 per acre.

* It feeds on seeds, nuts, acorns, and insects.

* It breeds from February through November and has litters of 3-5 with two to four litters.

* Tail is sharply bicolored white below, dark above, 2 to 5 inches long Body 2 ½ to 4 inches long, often difficult to distinguish from similar species.

* Has been a host of hanta virus.