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The parasite Xenos moutoni inactivates workers and castrates reproductives of the Japanese hornet Vespa analis. Using over 500 nests, we investigated the relationship between hornet nest size (number of cells) and the proportion of parasitized adults (i.e., prevalence) in central Japan. Over 3 years, 36–48% of nests had more than one parasitized adult, and approximately 3–5% of female adults (mostly...
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