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How Do I Know if I Have a Mouse Problem?

Blocks of mouse poison.
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  • Written By: Alex Tree
  • Edited By: Melissa Wiley
  • Last Modified Date: 22 June 2014
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Besides seeing an actual mouse, there are quite a few ways to determine if you have a mouse problem. Even one mouse will leave dozens of droppings per day, meaning a major infestation might be leaving hundreds or thousands of droppings. Look for these tell-tale signs in cupboards, gardens, and under furniture. Another sign of an infestation is small, sometimes perfectly round holes in cereal boxes, cabinets, and other chewable barriers that separate mice from food. Mice might also chew through computer and other electronic wires and nibble on leaves and vegetables in a garden.

Mouse droppings look like dark grains of rice or beans, and they’ll almost magically appear in all sorts of places. Mice leave these droppings frequently throughout the night, and even a dozen mice should be noticeable if you are looking in the right places. Pay special attention to areas near food and areas that are warm and dark. Droppings are a sure sign of a mouse problem, but they should not be confused with cockroach eggs, which resemble a dark but translucent capsule. Mouse droppings are solid, darker in color, and normally not uniform in shape.

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If you failed to find mouse droppings, look for holes in cupboards, walls, and all other places a mouse might want to pass through. Sometimes a mouse hole is a neat circular hole that looks as if someone drilled a hole for a pipe but did not place it. Other times it is a crude creation by a mouse that only chewed enough to get through. A mouse hole is sometimes slick with grease from mice fur, which can be greasy, similar to an unwashed human’s hair. If you have outdoor sheds or other buildings, check them too.

Besides chewing through obstacles, mice tend to chew on cords and other mundane items. In fact, it is not uncommon for mice to make a home in a vehicle and chew through important wiring. When not disabling a vehicle or computer, mice might be in the garden nibbling on leaf edges or vegetables. If so, the leaves are probably frayed in an odd way, or there is a distinct path through the garden. Mice tend to take the same path toward a destination, repeatedly trampling on the grass and making their route obvious.

Lastly, one way to discover a mouse problem is to find a mouse. Setting traps, cameras, or just being quiet at night and then turning on a light can reveal a mouse. If there is one mouse, there are probably more, and it is safe to say you have a mouse problem.

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Discuss this Article

AnswerMan
Post 2

@Reminiscence, I find that my mice problems depend on the outside weather conditions. If it's extremely cold outside, the mice tend to find their way inside to stay warm. It's the same with cockroaches. The heat draws them in. I use "no touch" traps that spring shut whenever a mouse looks for the bait inside. Traditional snap traps scare me, and I don't want my cats to find them accidentally.

Reminiscence
Post 1

When we moved into our current rental house, I noticed mouse droppings in the kitchen drawers closest to the sink. I found a small hole in the back of the sink compartment, and a crack in the outside wall behind it. I filled up the wall crack with caulk, then filled the hole with drywall plaster.

Apparently there were still some mice who were hiding in other places and were now trapped on this side of the escape route. Our cat found them before we did. Finding and fixing a possible mouse hole is good, but it's no guarantee that all of the mice are on the other side of that hole.

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