Barry photographed a number of galls, most on red oaks, but one on top of a goldenrod plant (see next photo). Oaks seem particularly attractive to gall-making insects. In fact, most galls on oaks are made by tiny little wasps in the Cynipidae family, although a few are made Cecidomyid flies. I once brought home a gall from a bur oak and in time, a tiny wasp emerged, so small it was barely visible to the naked eye. Oak galls can be found on twigs and leaves, and can assume a variety of shapes. Many are called "oak apples".