Why Mice Ignore One Trap and Take Another

Mice are not shy of new things

This is where most home trapping goes wrong, because people apply what they have heard about rats.

Rats are famously wary of anything that was not there yesterday and can take several days to approach a new object. Mice are the opposite: they are curious, they explore constantly, and they will investigate something new within hours of it appearing.

So the usual advice about leaving traps unset for a week is rat advice. With mice, if a trap has sat untouched for three days it is almost certainly not on a route they use, and moving it eighteen inches matters more than anything you do to it.

Photographs on this page are for illustration purposes only.

Placement is the whole thing

Mice run against edges. A trap in the middle of a floor is in the one part of the room they avoid.

• Hard against a wall, with the trigger end facing the wall so they meet it while running the edge.
• Where you have found droppings or a smear mark, not where you saw a mouse once.
• Behind and under appliances, in the back corners of cupboards, along the loft joists.
• Several of them, close together. Two or three a couple of feet apart on a single route will out-perform six scattered around a house.

That last point follows from how mice feed, which is the other half of the answer.

They nibble everywhere rather than eat in one place

A rat finds a food source and works it. A mouse takes very small amounts from a large number of points over the course of a night — which is exactly why you find nibbled packaging in four cupboards rather than one raided bag.

For control that changes the approach completely. A single point, however well baited, is competing with dozens of others. Several points spread along the actual routes is what works, and it is one of the clearest differences between a professional visit and a trap from a hardware shop.

It also explains why mice seem to ignore a beautifully baited trap while gnawing a cereal box two feet away. They are not ignoring it; it is simply one of thirty places they visited that night.

Bait, and what we actually use

Cheese is folklore. Mice respond much better to something sticky and aromatic that cannot be lifted off cleanly — chocolate spread and peanut butter are the reliable household ones — and the amount should be small. A large bait lets them feed without setting the mechanism.

Nesting material works too, and people rarely think of it: a small wisp of cotton wool or dental floss tied to the trigger is taken readily by a mouse building a nest.

What we use on a visit depends on the property, and it is not always a trap. Traps, bait where it is appropriate, and proofing get combined differently for a house with a toddler and a dog, a food premises, and an empty garage. That is what the survey decides, and it is why the technician looks before anything goes down.

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