Meadow Vole (Field Mouse) (Microtus pennsylvanicus)
The meadow vole, meadow mouse, field mouse, or field vole is among the most populous mammals in the northeastern United States. Female meadow voles have to start reproducing when they’re three weeks old, and then they have litters about every three weeks thereafter, presumably until they die. (Males wait until they’re around six weeks old to start reproducing.) Can you imagine?