In the Maritimes we see a lot of colonies, in the Spring, that have died as a result of obvious shrew predation.  For the first 4 years, I struggled with shrew damage before developing a shrew tight entrance system. This entrance system stays in place from December first till the first natural pollen flow begins. The 1/4″ hole causes the pollen to fall off the bees so I turn it up putting the 1/2″ holes down for the spring entrance reducer. This has prevented shrew damage in our hives for 30 years.

Read more information and see pictures of the Shrew Screen by Fletcher Colpitts