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It was shown that about 90% of the queens of Iridomyrmex humilis were executed by workers in May (at the beginning of the reproductive season), both in the field and laboratory. In laboratory experiments, there was no correlation between the percentage of queens executed and their weight, although...

Keller, L.; Passera, L.
Actes des Colloques Insectes Sociaux, 1989, No. 6, pp 287-293