Question about robber bees
by Kay Harnden
(Houston, Tx, USA)
By providing an additional entrance and/or ventilation, aren't you encouraging robber bees?
That's a good question.
You wouldn't want to create extra entrances on a new hive. In fact, making it easier for the hive to defend itself is the primary reason for reducing the entrance in a new hive.
But once the colony has built up to a substantial population, they are well able to guard and defend the expanded entrance area.
If you were to look at some feral hives (and there unfortunately aren't as many of those as their used to be), you'd find many that established themselves in a location with multiple entrances or rather large entrances.
So as long as the colony is strong in population, guard bees will defend multiple entrances (within reason) as thoroughly as just the one.