You bought traps, you set them, you caught one or two, and three weeks later the noise is back. This is the most common DIY outcome in Tucson, and the trap is rarely the reason.
1. You are trapping instead of excluding
This is the big one, and everything else is secondary to it.
Trapping removes the animals currently inside. It does nothing about the opening they used. In a neighbourhood with ongoing pressure — and most Tucson neighbourhoods have ongoing pressure from washes, citrus and open desert — an unsealed home gets reoccupied. You have not solved a problem, you have started a subscription.
If you take one thing from this article: sealing is the solution, trapping is the cleanup. In that order.
2. Placement is wrong
Rodents do not wander through open floor. They follow edges — walls, beams, pipe runs, duct lines — because contact on one side is safer.
Traps in the middle of an attic floor or the centre of a garage catch very little. Traps set flush against a wall, perpendicular to it, with the trigger end toward the wall, catch a great deal more. Set them where the droppings and rub marks are, because that is the actual route.
3. You are using too few
Two traps for an attic is not an attempt. Professional practice is a dozen or more for an active attic, set in pairs along identified runs.
The reasoning is partly mathematical and partly behavioural. Rodents breed fast enough that a slow removal rate never catches up. And some individuals are trap-shy, so a low-density set selects for exactly the animals you least want breeding.
4. Wrong trap for the species
Mouse traps do not reliably kill rats — they injure them, which creates a suffering animal and a trap-wary survivor. Rat traps under-trigger for mice.
Pack rats are a different problem again. They are large, strong and native wildlife, and standard approaches often underperform. If you have a furry-tailed rodent in the carport, the midden is the target, not the trap line.
5. Bait mistakes
Cheese is a cartoon. Rodents prefer high-fat and high-protein foods — peanut butter is the reliable default, and nesting material such as cotton wool works well during breeding season.
Use a small amount. Over-baiting lets an animal feed from the edge without applying force to the trigger. And handle traps with gloves; heavy human scent on a new trap reduces takes in the first nights.
6. You skipped pre-baiting
Rats in particular are neophobic — genuinely wary of new objects in a familiar environment. A new trap may be avoided for several days.
Set traps unset and baited for two or three nights first. Let them feed with no consequence, then arm everything on the same night. Take rates go up substantially.
7. You are not checking often enough
Daily. A dead rodent in an attic in Tucson becomes an odour problem quickly, and the odour phase lasts weeks. Daily checks also tell you whether your placement is working — three nights with nothing at a given location means move it, not wait longer.
On glue boards and poison
Glue boards are inhumane, largely ineffective against rats, and regularly catch lizards, snakes and birds in this region. We do not use them.
Poison has a specific failure mode in a home: the animal dies somewhere inaccessible — a wall void, a duct, above a ceiling — and you cannot retrieve it. It also carries secondary poisoning risk for owls, hawks, bobcats and pets, all of which are present across Tucson. Poison outdoors in bait stations has a legitimate role in some commercial settings; inside a house it usually trades a noise problem for a smell problem.
The honest test
If you have been trapping for three weeks and activity continues, more traps will not fix it. The entry points are open. That is the problem, and it is the only thing worth spending the next hour on.
Not sure what you are dealing with?
A free inspection identifies the species, every entry point and the scope of work — in writing, before anyone quotes you a number.
