The northern grasshopper mouse (Onychomys leucogaster) is a North American carnivorous rodent of the family Cricetidae.

[2] It ranges over much of the western part of the continent, from southern Saskatchewan and central Washington to Tamaulipas in northeast Mexico.

Throughout the night, the grasshopper mouse makes high-pitched noises, performed with a raised nose and opened mouth to claim its territory.

[3] This grasshopper mouse can be found in prairies with low grass, dry areas, and also pasture lands of the central and southwestern parts of the United States.

O. leucogaster has been known to associate positively with black-tailed prairie dogs, possibly due to their preference for disturbed areas, suitable habitat in the form of burrows, or food supply.

[7] The northern grasshopper mouse is an altricial species; baby mice are naked with closed eyes when they are born, and weigh about three grams.