Rats Identification Greenwich: What Signs Should You Look For?

Droppings

What to look for: dark, capsule-shaped and substantially larger than mouse droppings. Fresh ones are dark and soft-looking; older ones are grey, dry and crumble.

What it tells you: more than any other single sign. The location tells you where the route runs, because rats travel the same path repeatedly and droppings gather along it - a skirting line, behind an appliance, under a sink, along a joist. A concentration in one place is a run; a scattering across several cupboards is more characteristic of mice.

What it rules out: a scattering of very small droppings through drawers and cupboards is mouse rather than rat. Larger, more irregular droppings in a loft with daytime activity may be squirrel.

Smear Marks

What to look for: a dark, greasy, slightly shiny mark along the base of a wall, around the edge of a hole, along a pipe run or over a joist. It builds up over time and does not wipe away easily.

What it tells you: that the route has been in regular use for a while, and exactly where it runs. Rats keep body contact with a surface as they travel, which is what leaves the mark, so a smear at the edge of a gap is confirmation that the gap is a working entry point rather than just a hole.

What it rules out: mice generally do not produce noticeable smear marks. This is one of the more reliable discriminators between the two.

Gnawing

What to look for: damage to things that are not food. Cable sheathing, plastic pipework, timber, the corner of a plasterboard wall, the edges of stored boxes, the lip of a door. Rat gnawing is coarser and removes more material than mouse gnawing.

What it tells you: rodents gnaw constantly because their incisors grow continuously, so gnawing is not a sign of hunger - it is a sign of occupancy. Damage near cabling matters more than damage anywhere else, because it is a genuine fire risk.

What it rules out: very neat small holes in food packaging, with the rest of the packet undisturbed, are more characteristic of mice.

Burrows and Runs

What to look for: holes in the ground against a wall, under decking, beside a shed base, at the edge of a patio or next to a drain cover. Look for a worn path leading away from them - a run through grass, a flattened line along a fence base, a bare strip where vegetation has been pushed aside.

What it tells you: that the population is established outside and where its territory runs. A burrow with a clean, open entrance and a worn run is active; one that is partly collapsed and has vegetation growing across it is not.

What it rules out: mice do not usually excavate burrows of this kind in a garden setting.

Sound

What to look for: movement with weight behind it - under floorboards, in a ceiling void, behind a stud wall. Usually after dark, and usually in the same part of the property each night.

What it tells you: less than people think on its own, and quite a lot in combination with the time of day and the consistency of location. Repetition in one place over several nights is meaningful; a single noise once is not.

What it rules out: heavy movement during daylight hours points at squirrels rather than rats. Light, quick, high-up movement points at mice.

Smell

What to look for: a persistent, sharp, ammoniacal smell coming from one specific area rather than a whole room. Strongest in enclosed spaces - a cupboard that has been shut, a void, a subfloor.

What it tells you: an established population close by, or a dead animal. Both are worth investigating; they are not the same problem and the survey will separate them.

What it rules out: very little on its own. Drain faults and damp produce smells that people reasonably mistake for this.

Tracks

What to look for: footprints and tail drag marks in dust, or in a thin dusting of flour laid down deliberately overnight.

What it tells you: that a route is in current use, which is different from evidence that it was used at some point. This is the most useful thing a householder can produce, because it is current and it is specific.

Damage to Insulation

What to look for: loft insulation pulled apart, compressed into a mass, or with runs pushed through it.

What it tells you: nesting activity in the roof void.

What it rules out: insulation torn up and gathered in quantity near the eaves, combined with daytime noise, points at squirrels rather than rats - and squirrel work is a different service with a legal framework of its own.

Putting It Together

One sign is a reason to look harder. Two independent signs - droppings and a smear mark, tracks and gnawing, a burrow and a run - are a reason to act.

And if the picture that emerges points at mice, or at squirrels, tell us that at the enquiry. Getting the animal right first is what stops a treatment being aimed at the wrong problem.

Which Signs Mean Act Now Rather Than Watch

Not every sign carries the same urgency, and it is worth separating the ones that justify waiting a few days from the ones that do not.

Act now

• Gnawing anywhere near cabling. Rodents gnaw constantly and damaged cable insulation is a genuine fire risk. This is the one sign that should override any inclination to wait and see.
• Evidence in a food preparation or storage area.
• A burrow against the building with a worn run leading to it.
• Activity in a property with young children or vulnerable adults.

Reasonable to investigate first

• A single ambiguous noise with no other evidence.
• One sighting in the garden, with nothing inside the building.
• Old, dry, crumbling droppings in a place that has not been disturbed for months.

The middle ground - two signs, indoors, current - is where most enquiries sit, and it is a reasonable point to pick up the phone.