A mouse is a small mammal belonging to the order of rodents, characteristically having a pointed snout, small rounded ears, a body-length scaly tail and a high breeding rate. The best known mouse species is the common house mouse.

Cats, wild dogs, foxes, birds of prey, snakes and even certain kinds of arthropods have been known to prey heavily upon mice. Nevertheless, because of its remarkable adaptability to almost any environment, the mouse is one of the most successful mammalian genera living today.

Mice can at times be vermin, damaging and eating crops, causing structural damage and spreading diseases through their parasites and feces. Breathing dust that has come in contact with mouse excrement has been linked to hantavirus, which may lead to Hantavirus Pulmonary Syndrome (HPS).
Primarily nocturnal animals, mice compensate for their poor eyesight with a keen sense of hearing, and rely especially on their sense of smell to locate food and avoid predators.

Mice build intricate burrows in the wild. These burrows typically have long entrances and are equipped with escape tunnels/routes. In at least one species, the architectural design of a burrow is a genetic trait.