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Facts on the House Mouse

The house mouse is a small mammal named for its propensity to live within human habitats. They may also be used as laboratory subjects and contribute greatly to scientific studies.

House mice are covered in short hair that is light brown or gray to black in color, with lighter bellies. Their ears and tail also bear hair, although much less than their bodies. Adult mice weigh approximately 40 grams and can grow up to eight inches from the nose to the tip of the tail.

House mice walk, run and stand on all fours. They can stand only on the hind legs, as well, and are supported by the tail, which also provides balance while in motion. The house mouse has a sharp sense of hearing and communicates with other house mice through squeaks. Some of these squeaks are audible to humans, while others extend into the ultrasonic range.

House mice are nocturnal and build nests in sheltered locations. They are extremely territorial. Males may be aggressive, while females tend to remain in the nest, protecting their young.  

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