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In page Vespula flaviceps:

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V. flaviceps is found in forests. During a two-year study in Japan, the species was observed to be one of the predominant species in the natural deciduous forests of northern Kanto. In 2001, it was officially recorded as one of the predominant species in this area, making up, along with two other species, 91% of all social wasps caught in a forest sampled.[3] However, the same species was found to be much less abundant than Vespa species when attracted using a different bait.[3]