Affiliation: | ∗ Laboratory of Apiculture & Social Insects, Department of Animal & Plant Sciences, University of Sheffield, U.K. † Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, U.S.A. ‡ School of Biological Sciences, University of Bristol, U.K. § Laboratory of Apiculture & Social Insects, Department of Biological & Environmental Science, University of Sussex, U.K. |