I may have missed a link to a complete list of species tallied in this event, but the photographed birds are mostly Violet-Green Swallows. This species eats fly

I may have missed a link to a complete list of species tallied in this event, but the photographed birds are mostly Violet-Green Swallows. This species eats flying insects exclusively (source: Birds of the World research database) and would not be able to take advantage of feeders.