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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
