Wasps in the family Gasteruptiidae, such as Gasteruption longipleurale, are notable for their unique features such as an elongated neck and enlarged tibial sections of their hind legs. A new study published in Insect Systematics and Diversity finds these wasps’ enlarged tibiae turn out to be filled with insect fat body, and they may play key roles in flight dynamics, detecting vibrations from prey, and even detoxification. (Image originally published in Mikó et al 2019, Insect Systematics and Diversity)