I haven't made it down to the local feed store to see if they have DE. But I found some Permethrin in the barn I think the landlord put some on his cows. It says it is a garden and poultry dust. but reading the warnning label scares the heck out of me. I did a search and some put it right on the bird, others in the nest and shavings. any advice ? It is in a sprinkle can