Here’s another example of interesting insect behavior, a congregation of the scarab-hunting wasp Campsomeris trifasciata on the underside of a leaf. These wasps are solitary. Rather than having a nest where the wasps raise their young, eggs are laid individually be females inside beetle grubs. In one case I found online, a group of males were observed congregating on the underside of a leaf, but this group, but this group seems to be predominately female (you can see that one wasp, which is probably male, is much smaller than the rest).
It is unclear why this was happening. Adults feed at flowers, like many bees and butterflies, and there were not many flowers in the immediate vicinity. They were, however, in Emilio Wilson Park, where the grass had been cut recently. Perhaps this made it easier for them to find beetle grubs. Many of the species they parasitize have grubs that live underground, and the wasps actually sense them underground and dig to find them. Perhaps this was just a convenient spot to take a break between grub-searching missions.
