A few years ago we where over run with snakes. They where so bad that you couldn't stand on the driveway without one coming down it. Sitting on the back porch, they would come across the lawn. Our dogs where killing them, we where shooting them, and they just kept coming. I think we killed around 50 that year. I know I got 24 myself.
Then we had a pregnant cat show up and have her babies. Then another cat showed up and she had some more babies. In about a year, we had 20 cats!!! They ate all the mice, which where feeding on the chicken food, and bringing in the snakes. No more mice, no more snakes. Almost no snakes. We still have a few, but now it's just a couple a year.
Same thing with mowing out on the land. I was never able to get all of it mowed before, and I usually saw a snake somewhere while out there, but since getting the 12 foot batwing, and being able to mow everything a couple times a year, I haven't seen a single snake while mowing. It's very odd to go from snakes everywhere, to not seeing very many at all.