I made my 8 week old chicks a dust bath - saw a post on here somewhere but can't find it now - out of peat moss & DE in a great big terra cotta bowl. They started eating it - not just scratching & pecking around, but gulping down big mouthfuls of it like they were starving... Why would they do this? I was worried it might hurt them, or fill them up so they wouldn't eat more nutritious food, so I took it out. They were not happy. They have plenty of food & treats, and plenty of grit - both mixed into their feed and offered in a separate bowl. And there is always DE sprinkled around in there, so it's not the first time they've seen that... Should I just leave it in there & let them eat until they figure out it's no good? But then I read somewhere a comment about "I gave up on my chickens knowing what's good for themselves when I came upon my flock eating a block of styrofoam" can't remember who posted that but it sure made me laugh!