Why Correct Identification Matters
Many Walthamstow homeowners call us saying they have “mice” when they actually have rats — or vice versa. While both are unwelcome, they behave very differently, and the wrong treatment approach can waste time and money.
Physical Differences
House Mice
- Size: Small — body 7–10cm, tail roughly the same length
- Weight: 15–25 grams
- Colour: Light brown to grey with lighter belly
- Ears: Large relative to head
- Droppings: Tiny, 3–8mm, pointed at both ends
Norway Rats (Brown Rats)
- Size: Large — body 20–27cm, tail shorter than body
- Weight: 200–500 grams (up to 10x heavier than mice)
- Colour: Brown/grey with lighter underside
- Ears: Small relative to head
- Droppings: Larger, 12–20mm, blunt at both ends
Behaviour Differences
Mice are curious and will investigate new objects quickly. They tend to nibble small amounts from many food sources. They can squeeze through gaps as small as 6mm.
Rats are cautious and neophobic — they avoid new objects in their environment. They tend to feed from one or two reliable sources. They need gaps of at least 20mm but can gnaw through most materials.
Why This Affects Treatment
Because rats are neophobic, bait stations need to be placed strategically and left undisturbed for several days before rats will approach them. Mice, being curious, will investigate bait stations almost immediately.
Using rat-sized bait stations for mice (or vice versa) can lead to treatment failure. A professional pest controller will always correctly identify the species before designing a treatment plan.
Need Help Identifying Your Pest?
Send us a photo of the droppings or damage, and our qualified technicians can identify the species immediately. Contact us for a free assessment or call +44 7774 385794.
