Field Notes - not sure of species or family. think it was an Acacia that it was feeding on
So strange!! They all cooperated in sync, found this online - "(b) Early instars exhibit cycloalexic ‘circle-the-wagons’ behavior, thought to be a defensive formation." (https://www.sciencedirect.com/topics/medicine-and-dentistry/insect-society)
even smaller ones on the same plant as previous observation of Pergid Sawflies