Think you saw something scurry across the floor? At a quick glance, it can be tricky to determine if it was a mouse or a rat. Knowing what you’re dealing with is key to eliminating the infestation and keeping your home rodent-free.
From size to behaviour and droppings to chew marks, here we help you to identify the differences between the two.
The physical differences between mice and rats
The easiest way to determine which of the two rodents has made itself at home in your property, is to get a good look at it. There are a number of physical differences between mice and rats.
Size and body shape
- Mice are generally much smaller than rats, typically growing to about 2.5 – 4 inches in body length (not including the tail).
- Rats are significantly larger, ranging from 6 – 9 inches in body length, sometimes even bigger depending on the species.
Tail differences
- Mice have long, thin tails covered in fine hair.
- Rats have thicker, scaly tails which are usually hairless and can appear more textured.
Ears and head shape
- Mice have proportionally larger ears and a more triangular, pointed snout.
- Rats have smaller ears relative to their head size, with a blunter, more robust snout.
Behavioural differences
Rodents like to keep themselves hidden so will often nest in quiet, undisturbed areas and then come out at night when offices are empty and people are sleeping. Often the only signs of infestation are droppings and gnaw marks so it’s helpful to know the difference between mice and rats, even if you haven’t physically seen one.
Dropping size and quantity
- Mice leave small, rice-sized droppings (about 1/8 inch long) and there tends to be a lot of them.
- Rats leave larger, capsule-shaped droppings (about 1/2 inch long) and there won’t be as many.
Nesting preferences
- Mice prefer to nest indoors in warm, hidden areas like walls, cabinets and furniture. They shred paper, fabric and insulation for their nests.
- Rats are more likely to burrow outdoors or seek shelter in basements, sewers or attics. They may use similar materials but are more likely to burrow.
Feeding habits
- Mice are more curious and will explore new food sources more readily.
- Rats are more cautious and may avoid new foods or traps until they feel safe.
Gnaw marks
- Mice create smaller, more delicate chew marks.
- Rats leave rough, bigger bite marks.
Sounds
- Mice tend to make high-pitched squeaking sounds.
- Rats produce deeper scratching and gnawing noises.
Footprints and grease marks
- Rats leave more visible tracks and greasy marks due to their larger size and oily fur.
What to do if you think you have a rodent infestation
If you’ve spotted the signs of mice or rats in your home or commercial premises, it’s important to take action quickly. Eliminating food sources and sealing entry points are critical when it comes to preventing further intrusion.
Infestations can be tricky to eradicate so we always recommend calling a professional pest controller as soon as possible. Head to our rodents page to find out more about the control services we offer for mice and rats.
Alternatively, get in touch to arrange a free, no obligation quote.
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