5 ways to tell the difference between mice or rats in your home (2024)

5 ways to tell the difference between mice or rats in your home (1)

Whether you’ve spotted a rodent or suspect activity, nobody likes the thought of having a pest invasion. Figuring out how to get rid of mice (and how this differs from how to get rid of rats) can be unnerving at the best of times. Not only can rodents be a nuisance and cause property damage, but they are known to carry a host of diseases or trigger allergies that can affect your health.

But how do you know whether it’s a mouse or rat? It’s quite easy to mistake a young rat for an adult mouse if you can't tell them apart. In which case, knowing how to identify between the two rodents, and what to look out for, will make all the difference to methods of pest control.

Spotting these telltale signs of mice or rats will also indicate any problem areas where rodents might be entering your home. In which case, you’ll need to block all points of entry, including holes in brickwork, baseboards, around pipes and vent openings — which are some of the things that are attracting pests to your home.

So, before you call in pest control, here are the ways to tell the difference between mice or rats in your home.

1. Differences in appearance

5 ways to tell the difference between mice or rats in your home (2)

If you’ve had the misfortune of spotting a rodent scurrying away, there are key differences to tell if it’s a mouse or a rat. Perhaps the main telltale sign is its size. Typically, adult mice grow up to 7 ½ inches in length (including tail), while adult rats are up to 18 inches in length.

Another key indicator are their tails — mice have thin, slightly hairy tails, while rats tend to have a thicker, scaly tail without hair.What’s more, a mouse has a triangular-shaped nose, and a rat’s nose is more rounded, wider and blunt. Generally, mice and rats can be brown or gray in color, but rats can also be black.

2. Droppings size

5 ways to tell the difference between mice or rats in your home (3)

It’s always annoying when you spot droppings in or around your home, which is usually a telltale sign of rodent activity. This is also a good indicator to tell the difference between a mouse or rat.

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Generally, mouse drops are small, measuring about ¼ inches long, and often resembling grains of rice with pointy ends. These are brown/black in color and usually found where mice travel and eat, such as under cabinets, inside the back of drawers, behind a stove, or in the pantry.

Rat droppings on the other hand, are double the size of mouse droppings, usually measuring about 3 ½ inches long, with blunt ends.

3. Movement of foods

One of the main things that attract rodents to your home is a constant food supply. However, while mice eat small amounts of food at one location, rats tend to collect and move food from one place to the next.

This is because rats are larger in size and physically able to carry more food to hoard, and feast on. That’s why it’s always important to keep food/kitchen areas clean at all times. Sweep up any crumbs on floors and surfaces, and disinfect the areas with a cleaning spray. This will prevent rodents from coming to visit, since there are no longer treats for them!

4. Size of gnaw marks

5 ways to tell the difference between mice or rats in your home (5)

Another indicator to look out for are gnaw marks. Whether it’s on a wall, or a cardboard box has been chewed on, there are distinct differences to know if it’s by a rat or a mouse.

Rats leave larger, incisor-pair gnaw marks, and have the ability to remove much more material and cause more damage. Besides chewing holes in things, they also leave more jagged edges along the materials than mice.

Mice can be just as destructive, but leave small, clear-cut holes, about the size of a dime. They also leave smoother edges along any gnawed materials.

5. Trap avoidance

5 ways to tell the difference between mice or rats in your home (6)

If you’ve set up mouse traps in trouble areas — without much success, you might be dealing with rats instead. Interestingly, mice are curious creatures, and like to investigate anything new. So, setting a trap directly in their path, with bait, would likely attract them.

Rats on the other hand are not as curious, and would choose to avoid things in their path. Such behaviours lessen as they get used to something new. Experts advise placing unset traps in the rat's path for several days before setting the traps.

Of course, if you’ve spotted these telltale signs, and are uncomfortable with trying to trap a rodent yourself, you can always call in a professional. Their expertise can help with the best placement of the traps as well as finding potential entryways. Plus, they can help dispose of the rat once it’s successfully caught as well.

More from Tom's Guide

  • Try one of these 7 plants to repel mice and rats
  • Plus, 7 places mice like to hide and what to look out for
  • Find out what are the 7 things that attract rats and mice to your home

5 ways to tell the difference between mice or rats in your home (7)

Cynthia Lawrence

Content Editor, Homes

As the Homes Content Editor, Cynthia Lawrence covers all things homes, interior decorating, and garden-related. She has a wealth of editorial experience testing the latest, ‘must-have’ home appliances, writing buying guides and the handy ‘how to’ features.

Her work has been published in various titles including, T3, Top Ten Reviews, Ideal Home, Real Homes, Livingetc. and House Beautiful, amongst many.

With a rather unhealthy obsession for all things homes and interiors, she also has an interior design blog for style inspiration and savvy storage solutions (get rid of that clutter!). When she’s not testing cool products, she’ll be searching online for more decor ideas to spruce up her family home or looking for a great bargain!

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2 CommentsComment from the forums

  • Domain Rider

    Er, rat droppings are not "about 3½ inches long" - unless you live near Chernobyl...

    They're more like ½-¾ inches long - as your article on "How to get rid of rats quickly and safely" says.

    Reply

  • COLGeek

    We need to marry up the rat/mouse problem with the snake problem...

    https://forums.tomsguide.com/threads/7-signs-there-are-snakes-in-your-yard-%E2%80%94-what-to-look-out-for.530769/

    Reply

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5 ways to tell the difference between mice or rats in your home (2024)

FAQs

5 ways to tell the difference between mice or rats in your home? ›

Mice have thin, slightly hairy tails; rats have a thicker, hairless, scaly tail. The nose of a mouse is triangular in shape; the nose of a rat is more blunt and rounded. Both mice and rats can be brown or gray in color, but rats can also be black. Mice droppings are approximately 1/4 inch long with pointed ends.

How do I know if it's a rat or mouse in my house? ›

Additionally, rats have a more blunted snout than mice, and their greasy fur can give them a shiny appearance. Mice, on the other hand, can be distinguished by their smaller size (usually maxing out around 8in) and larger ears. Mice also have a characteristically pointed snout and thinner tails than rats.

What scent will keep mice away? ›

The strong scent of peppermint is overwhelming to mice. Similarly, essential oils such as eucalyptus oil, bergamot oil, clove oil, and cinnamon oil are potent in keeping mice at bay. One study noted that eucalyptus oil applied once a day was more effective as a rat repellant than once a week.

Where do rats go during the day? ›

Inside, rats can be found hiding out in holes, cracks, and crevices; climbing up through drains in bathrooms and kitchens; behind cabinets; behind and under appliances; in air ducts and ventilation systems; in piles of clutter; in storage containers; in hollow walls; and in crawlspaces, attics, garages, and basem*nts.

Will rats leave if there is no food? ›

Rats are also known to adapt to certain environmental conditions. These pesky creatures can survive on little food and water. This means that even if your house does not provide enough food, they will still squeeze through openings to look for food and return to their nests.

What sound do rats make at night? ›

Do Rats Make Noise at Night? Rats, like mice, are nocturnal, so you're more likely to hear them moving around or scratching and gnawing at night if you're awake.

Do rats come out in daytime? ›

With so many humans and noise going on at night in clubs, rats don't feel comfortable coming out at night, so they are forced to come out in the daylight hours to find food and water. Most sightings of rats during the daylight hours are usually in gardens or other outdoor areas.

What repels mice immediately? ›

Mice are very averse to strong smells, so these can be used to keep them away from your home and property. Try things like ammonia, bleach, moth balls, or essential oils like peppermint, clove, tea tree, rosemary or cinnamon.

Will sleeping with lights on keep mice away? ›

Will sleeping with lights on keep mice away? No, sleeping with lights on is ineffective for keeping mice away.

What time of night are rats most active? ›

 Rats and mice are nocturnal with most activity taking place between approximately one half hour after sunset to about one half hour before sunrise.  Garbage is an excellent food source for rodents.

How do you make rats come out of hiding? ›

There are two effective ways to drive rodents out of hiding: using food bais to attract them outside and utilizing repellents to force them out of the nest. If you choose to bait them, bait like peanut butter will attract them outside in no time.

What attracts rats to your house? ›

Food of Any Kind

Of course, rats are most attracted to food. A home with easy access to food of any kind, including scraps and crumbs, virtually asks rodents to invade your home.

How do I get rid of rats ASAP? ›

So, what is the fastest way to get rid of rats? Pest control is the most efficient method to get rid of rats quickly but the usage of mouse traps, snap traps, chemical baits, and live traps are all effective methods to get rid of rats as quickly and effectively as possible.

Will a dead rat deter other rats? ›

Rats are social creatures, which means that if you find one dead rat, there are likely more living rats somewhere nearby. To help avoid coming across another rat, be it dead or alive, you'll need to take the following preventative measures: Keep up with building repair and maintenance to eliminate entry points.

What do rat holes look like? ›

So, what does a rat hole look like? The entrance to a rat's burrow is typically 2 to 4 inches across. Active burrows have smooth walls and the dirt is hard-packed with loose dirt fanning out at the entrance. The entrance will also be clear of debris and spider webs.

What does a rat sound like in your house? ›

You can hear scratching, gnawing, and rustling in your attic or inside walls. Rats also chomp and grind their teeth (bruxing).

Where do mice or rats hide in a house? ›

Indoor Hiding Places

Wall voids that are insulated and located close to heat sources. Voids in and behind large kitchen appliances. Areas that are hidden by stored items and clutter. Inside furniture and infrequently emptied or inspected storage boxes.

Is it better to have a mouse or rat in your house? ›

Both of these rodents can cause unique problems for your home and family. Rats are larger and can be more aggressive. If they feel threatened, they may even bite. Because of their size, a single rat can cause more damage to a home than a single mouse.

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