---- Suz <[log in to unmask]> wrote: 
> So far, I've caught eleven mice around my hive stand.  Unfortunately, I think I gave them egress into the hive when I added an Imrie shim with upper entrance. 

Agreed. Champagne corks fit very neatly into the plastic plug that covers the entrance to the Imrie shim. I rely only on the notch in the inner cover to provide ventilation and egress. The corks provide a thermal barrier to the thin sheet of plastic that's used to make the plug. That entrance is about the size of a quarter, way too large for northern climates or locations with field mice populations.

Przemek

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