Researchers observing Vespa soror wasps visiting a bee hive recorded their behavior in which they rubbed their abdomens on the hive near its entrance. Each white dotted line traces the path of the wasps’ rubbing. The rubbing appears to leave a chemical signal to other wasps to recruit them for a group attack on the hive, and a new study suggests two glands found on the underside of V. soror abdomens are likely involved in this chemical signaling. (Image originally published in Mattila et al 2021, Annals of the Entomological Society of America)