I happened to see one of the chickens eat a tapeworm from a fresh "pile" left behind from one of the many animals in the yard. I tried to get her to drop it but could only get part of it from her. I was told to feed the 'flock' (5 hens) diatemateous earth and that would do the trick. I was also told there should be no tapeworms that pass into the eggs even before that. Can anyone confirm this for me? And if I were to feed the chickens this on a monthly basis as a preventative measure (like I need to do with the cats but am clearly behind schedule) would it be harmful to the birds?