Sneaky Signs You May Have Mice, Even If You’ve Never Seen One

I absolutely love the feeling of winter when you can finally curl up with a blanket and a good book and just listen to the wind howl outside. It feels safe and warm in the house. But the unfortunate reality is that humans aren't the only ones looking for a cozy spot to wait out the cold weather. Mice hate the cold, and will sneak into any house they can find, no matter how clean or messy it is. They just want warmth and food. It can feel really unsettling to think about sharing your space with them, but catching mice early can stop an infestation before it starts.

Mysterious Sounds In The Walls

A mouse looking out through a hole in a wall.
Photo Credits: africaimages / Envato Elements
Photo Credits: africaimages / Envato Elements

One of the first times you notice mice is when it’s silent in your house. Since mice are nocturnal, you might start hearing faint scratching or scurrying sounds in the ceilings or behind the drywall right as you are trying to fall asleep. It is easy to dismiss it as the house settling but trust your gut on this one. The experts say that soft scurrying usually points to mice while heavier thumping sounds are more likely to be rats. If you hear it during the day it might actually be squirrels instead.

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That Strange Ammonia Smell

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A man plugging his nose after smelling a bad smell.
Photo Credits: insidecreativehouse / Envato Elements
Photo Credits: insidecreativehouse / Envato Elements
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If you start noticing a weird or musky scent that you just can't place, it might be time to investigate. Mice leave behind urine that has a very distinct and heavy ammonia smell. It smells a bit like a stale litter box or strong cleaning chemicals. As the infestation grows the smell will get much stronger and more noticeable. Try to follow your nose to where the scent is strongest because that is likely where the mice are nesting or spending most of their time.

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Finding Droppings

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Mouse droppings on white surface.
Photo Credits: towfiqu_barbhuyia / Envato Elements
Photo Credits: towfiqu_barbhuyia / Envato Elements
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Droppings are the sign that nobody wants to find but they are undeniable proof that there are mice in your house. You should keep an eye out for small dark pellets that are about the size of a grain of rice with pointed ends. If you find them scattered around, it is a classic sign of mice. Squirrels tend to leave droppings in piles but mice leave little trails as they move. The volume of what you find can tell you a lot about how many visitors you actually have so pay attention to how many droppings there are.

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A Raided Pantry

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A mouse who chewed a hole through a cardboard box.
Photo Credits: africaimages / Envato Elements
Photo Credits: africaimages / Envato Elements
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Mice are surprisingly determined when it comes to getting dinner. You might notice small holes or rough edges on your cereal boxes or bags of flour. They gnaw through cardboard and plastic with ease to get to the food inside. These marks are usually shallow and fine. It is often the biggest giveaway that you’re dealing with mice because other pests generally don't chew through packaging the same way. If you see a box of crackers that looks tampered with do not take chances and just toss it out immediately. Mice carry a lot fo germs.

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Smudges Along The Floorboards

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Black smudges on wall from a mouse's fur.
Photo Credits: ManMade DIY
Photo Credits: ManMade DIY
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This is one sign that people often miss because it looks just like regular dirt. Mice have natural oils in their fur and they tend to stick to the same routes along walls and baseboards. Over time this leaves behind greasy rub marks or dark smudges near the floor. You might also see tiny nail marks or footprints along the baseboards if you have a dusty corner. Grab a flashlight and look closely at the floor and bottom of your walls to see if there are tracks that shouldn't be there.

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Shredded Paper And Fabric

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Mouse in shredded paper nest.
Photo Credits: tirc83 / Getty Images Signature / Canva Pro
Photo Credits: tirc83 / Getty Images Signature / Canva Pro
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Mice are expert builders and they will use whatever they can find to make their nests comfortable. You might stumble upon little piles of shredded paper or insulation tucked away in a quiet corner of the basement or behind a dresser. They also love dryer lint and bits of fabric. If you find a stash of soft debris that looks like it has been gathered on purpose you have likely found a mouse nesting site. Check the warm and undisturbed areas of your home first.

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Seeing One In The Daylight

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A mouse on a shelf.
Photo Credits: LightFieldStudios / Envato Elements
Photo Credits: LightFieldStudios / Envato Elements
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It sounds contradictory but spotting a single mouse during the day is actually a sign of a larger problem or infestation. Because they are nocturnal and secretive, mice usually prefer to stay hidden when we are awake. If one is bold enough to come out while the sun is up it often means that their nest is overcrowded and they are being forced out to compete for food. It is a major red flag that the population has grown larger than you realized and you need to take action ASAP.

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Realizing you might have mice can feel really stressful, but please remember that it happens to the best of us. It is not a reflection on you or your home cleanliness. The most important thing is to seal up those little cracks in your walls and clear out any clutter where they might be hiding. If the signs keep piling up, do not hesitate to call a professional exterminator or pest control expert. It is better to handle it now and get your peace of mind back so you can enjoy your cozy home again.