I have poked around the web and on BYC and the info is either too old, or for a handful of birds. I have a large flock 200-400 birds free ranging. Some are small chicks a couple months old and up in age. I would like a wormer that I can treat each bird individually with a syringe to the beak. something with no egg withdraw would be nice. We have Large round worms that we know of, wouldn't doubt that others exist. Would rather treat individually so I know that it has been done.