My theory is to stay dewormed 24/7 using Olive leaf & Oregano with weekly Dewormer "Potassium" rich herbs like walnut and the most famous "wormwood" and Clark's suggested clove just for good measure. A little pumpkin seed never hurt either!
All works for animals as well and now I will soon know with birds. I see no reason why the dewormer herbs would hurt birds, but experimentaion tells the tale.