I've always said that more often than we realize, there are two queens
in a hive. Well here's a good one:
    Yesterday I was uniting requeen nucs with the parent colony, killing
the old queens when I found them. I opened the parent, and upon pulling
the first frame of brood (looking for the old queen), I noticed
something was un-ordinary. The brood pattern was perfect. Zillions of
eggs, and brood in every stage. In the middle of the comb was a hatched
queen cell. I know that a honeyflow can make a poor queen look better,
but not this good. I got out my shaker box and went to work shaking the
bees through it. As they ran down through the excluder, they left a
beautiful looking queen on top of the excluder. Ah, and there's the new
queen I says to me. I continued to shake bees. With three combs left in
the brood box to shake, I spotted the old queen on the excluder. The old
rat tail I says. Cool! I just knew there were two queens in this hive. I
begin placing the last comb back in the brood nest, when what just about
jumps into my lap but another big yellow fatty. HA! From the looks of
the two young queens, and the brood pattern, I believe all three queens
were laying in the hive.
                                                           Mike