If you catch a few and then the activity returns, it’s not bad luck — it’s predictable.
Reasons include:
- Nests in inaccessible areas such as insulation, crawl spaces, attics or basements;
- Food sources still available, even if hard to notice;
- Entry points not fully sealed — a single gap is enough;
- Reproduction rate exceeding the effectiveness of traps.
At this stage, the question changes from
how to get rid of mice to
how to eliminate the entire rodent population, which typically requires professional intervention.