i use alot of de earth too its great stuff but can't find it in the stores here i have to order online can be expensive..i use it where i keep their food too it's great to keep ants,slugs and flies away..Could be!! Certainly makes me sneeze my head off. I'm obsessed with keeping mites at bay and have DE everywhere! And I mean everywhere? Coop walls, perches, nest boxes, dust baths. I dust the birds with it too. Could do with shares in a DE company I think.
They could have done if you have found no evidence of a predator attack. We have chicken napping and dog napping from gardens over here in the UK. You can't have anything I tell you. They even go round nicking horses rugs of their backs in the fields.