a Beekeepers snip followed by > my comment 
My guess is that these bees are finding themselves a long way from home at dusk - perhaps through being caught out by bad weather - and then just joining the nearest colony that they can find.  But that is just a guess...

>Could happen.  It could also be the these hives are weak (for whatever reason) and the guard bess simple let them in < bees being haploid not all will guard the front entry with the same effectiveness. It also seems some 'kinds of bees' do a better job at guarding the front door than others.

>It seems to me if you think this is a problem that robber guards are a good thing to consider < likely more doable for the back yard apiary than for folks with large numbers.

Gene in Central Texas..

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