Scientific name: Mus (musculus) domesticus
Appearance: The House Mouse is greyer than both the Wood Mouse and the Yellow-necked Mouse and has smaller eyes, ears and hind feet. Its tail is naked and it has a more pointed nose than other mouse species.
Size: Head and body 6-10 cm; Tail 6-10 cm; Weight 12-22 g.
Natural history: The House Mouse is nocturnal and is active throughout the year. It lives either in burrows in the ground or - if in buildings - in drains, roof spaces or behind walls. It can breed at any time of year with each female capable of giving birth to between 5 and 10 litters a year each containing 5-8 young. The juveniles reach sexual maturity at just 5 or 6 weeks old. Will feed on almost anything if indoors, outdoor populations eat mainly grain.