Merck Manual

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Mice at a Glance

Mice at a Glance

Life span

1.5 to 2.5 years

Weight

20 to 40 g

Length (including tail)

6 to 7 in (15 to 18 cm)

Normal body temperature

98°F to 101°F (36°C to 38°C)

Heart rate

450 to 600 beats per minute

Estrous cycle

4 to 5 days

Duration of pregnancy

19 to 21 days

Litter size

10 to 12 young

Weaning age

21 to 28 days