well I searched that and found that they breed year round basically, they don't hibernate, so they can have up to 10 liters a year, with an average of 5 each liter. So that is 50 babies. Keep in mind if half the offspring are female and they can have a liter within 30 days of age, well, that's alot of voles. Once they settle into an area, if they don't have something preying on them, they can take over rather quickly and ruin alot. Catching a few in a trap here and there isn't going to do anything really when they increase like that. I have tried putting out the poison bait blocks, and I can't tell they eat them, it's like they know and avoid them. Now that I have a dog and and 2 cats, I don't use them. Thinking about setting the whole place on fire
