- Inside the cavity, the female makes a neat cup from fur she gathers. She also makes a fur plug or cap that she uses to cover her eggs when she leaves the cavity.
- Early in the breeding season, the male leads the female to cavities in his territory and may enter while she watches. She ultimately selects the cavity.
- Renesting attempts and second clutches are in different cavities from the first attempt, but both boxes and natural cavities often are reused in subsequent years.