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Actually, I have not tried that yet. I have used Sevin Dust which has some effectiveness.
I used to run a feline rescue program and I used DE on the youngest kittens. It was the only thing I believed safe enough. Once I was brought a mama cat with 6 kittens, less then a week old. They were completely covered in fleas! I dusted them and they were flea-free within 2 days. For the chickens/guineas I put some in their sand run periodically. I also pour some in their dustbath holes when I find them. You can dust dogs too, but most people use frontline or advantage (the stuff sold in grocery stores only works in the mildest cases) If your yard is actually infested, you may need to use something stronger to treat the yard. Once all the animals are treated, the fleas will stop coming back. I can't see a chicken or guinea not eating a flea if they see it, but the little buggers hop pretty far & fast so I'm sure they miss more then they catch.