Two issues here Bob. Firstly, mouse plagues arise in grain growing areas, not the bush as I would describe it; there is often nary a tree in sight. Secondly, the gestation period for mice is about 3 weeks and they are sexually mature at 6-8 weeks. Cats on the other hand have a gestation period of a little over 2 months and are not sexually mature until at least 3 months and usually much older (7-12 months). Also, litter sizes are generally larger in mice. More simply, in good conditions, mice can breed up very much faster than the cats.
Cheers
KarlB
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