House Mouse

Overview

The house mouse (Mus musculus) is a small rodent belonging to the family Muridae. Adults measure roughly 7.5 to 10 centimetres from nose to tail base, with a tail of a similar length, and typically weigh between 11 and 30 grams - about the same as a few coins.

In the wild, house mice range in colour from grey and light brown to black. Pet fancy mice, however, come in a wonderful range of colours from white to champagne and beyond, making each one look a little different.

House mice have been kept as pets and bred as fancy mice for a long time. They are one of the most successful small mammals on the planet, thriving in a huge variety of environments thanks to their close relationship with people.

Temperament & behaviour

House mice are mostly crepuscular or nocturnal, meaning they are most active around dawn, dusk, and through the night. They are naturally averse to bright lights, so expect your mouse to be liveliest when the room is dim.

They are agile little animals - good jumpers, climbers, and swimmers. They can leap vertically up to 45 centimetres, so a secure enclosure is a must. You may also spot your mouse rearing up on its hind legs using its tail for support, a behaviour known as tripoding, which they use when eating, exploring, or staying alert.

Mice are territorial by nature. A typical group consists of one male living with several females. If you keep more than one male together, they can become aggressive unless they have been raised together from birth, so it is worth keeping this in mind when planning your setup.

They communicate a great deal through scent - males in particular mark their territory with urine, which does have a noticeable odour. They also use whiskers to sense surfaces and air movements around them, and produce high-pitched squeaks to communicate.

Care basics

House mice construct nests from soft materials, so providing things like paper-based bedding or tissue will keep them happy and busy. They like to live near a reliable food source and feel most secure in hidden, cosy spots.

They are omnivores that primarily eat plant matter but will also eat a wider range of foods. In captivity, a balanced diet suited to small rodents is important for their wellbeing.

Mice sleep a lot - captive house mice average around 12.5 hours of sleep per day - so do not be alarmed if your pet seems to snooze through much of the daytime. Providing plenty of enrichment, such as climbing structures and things to explore, will keep them stimulated during their active hours.

Because they are social animals, keeping females together can work well, as related females will often nurse cooperatively. Males housed together from birth may also get along, but introductions of unfamiliar adult males can lead to fighting.

Health awareness

The tail plays an important role in a mouse's health - it helps with balance and is also the main way they regulate body temperature. Keeping an eye on the tail for any changes in appearance is a good habit.

Mice have a second small thymus organ in the neck, near the trachea, in addition to the usual one in the chest. This is a normal feature of the species, not a cause for concern.

As with all small pets, it is worth watching for changes in behaviour, appetite, coat condition, or activity levels, as these can be early signs that something is not quite right. Mice are prey animals and may hide signs of illness, so gentle, regular observation is helpful.

If you notice anything unusual, always seek advice from a vet who has experience with small rodents. General awareness of your mouse's normal habits makes it much easier to spot when something seems off.

This is general awareness only, not veterinary advice. Always consult a vet about your pet's health.

Fun facts

House mice can jump vertically up to 45 centimetres - impressive for such a tiny animal! They are also capable swimmers and skilled climbers, making them remarkably athletic little creatures.

Mice see the world a little differently from us. They are dichromats, meaning they have only two types of cone cells in their eyes compared to our three, so they do not perceive the full range of colours that humans do. They do, however, have a high density of ultraviolet-sensitive cells in part of their retina.

The complete mouse genome was sequenced in 2002, and mice are considered one of the closest relatives of humans among non-primate mammals. Their long history alongside people stretches back thousands of years, long before they became beloved pets.

Mice use their whiskers not just for feeling surfaces but also to detect air movements around them - a handy built-in early warning system for such small animals living in a big world.

Source

Adapted from Wikipedia (CC BY-SA 4.0): https://en.wikipedia.org/wiki/House_mouse