While the fields are untouched, the voles reproduce rapidly. Voles have 10-12 litters a year with 5-10 young in each litter.

• 虽然田野看上去并未受损,但田鼠已经快速繁殖,每年每中雌性田鼠要产10-12窝,每窝有5-10只田鼠幼仔。