The house mouse, a common pest animal throughout the world, is primarily nocturnal, but mice are a broad group of animals and various species differ in whether they are active during the night or day. Most species, but not all, are primarily nocturnal.
House mice that live inside human dwellings may have altered activity patterns to forage during the day, but most follow their ancestral pattern of nocturnal activity. Species designed for daytime foraging generally have better eyesight than nocturnal mice. Nocturnal species rely on their large ears and their sensitive noses and whiskers rather than vision. House mice have keen vision in addition to good senses of smell, hearing and touch, allowing them to be more flexible in their activity patterns.