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>While I have never seen 2 queen hives, I know others have, how common, and what circumstances?
I have seen it suggested that around 10% of hives commonly have 2 queens. Not sure that is true, but we do see 2 queens quite often - perhaps because we select for A.m.m. Marking queens obviously increases your chances of seeing this.
>Do they fight in a supercedure?
We usually see queens superseding in the autumn and the two queens seem to co-exist amicably, often on the same comb and sometimes walking over one another. The old queen seems to die during the winter, although we once found a hive with mother and daughter present on first inspection in the spring - but the old queen was not seen on subsequent inspections despite a thorough search for her. I have no idea how they die, but given that they are often four years old I would suggest 'natural causes'.
Best wishes
Peter
52°14'44.44"N, 1°50'35"W
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