For excluding mice from four hives this winter, I plan to use
aluminum angle iron fastened across the entrance on plastic bottom
boards.
   What size holes will allow drones to escape and still keep mice out?
(in inches, please)
    I have, in the past, used a queen excluder under the colony as a
mouse excluder.  This works fine, but installing the excluder means
hefting  heavy hive bodies.
    I am trying to think of a clever way to use the metal parts of old
queen excluders (the ones with wooden strips separating narrow bands of
excluder wire) as mouse excluders.
Tim
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Tim Sterrett
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(southeastern) Pennsylvania, USA