Have you checked to see if mabe there are ants under the litter, my peas have steped in ant piles before causing them to pick their feet.
Just a thought
Pecking feet- first time postin - Page 2
Can I ask why they are seperated? they should be fine growing up together as they do not breed til 2 years old. I don't think they have mites as I have one (juvie) that does it and she is on pine shavings. Could be that she has a scrape and it is bothering her. Do they go up on a perch? Mine just started to go up and she has stopped pecking at her feet. They all would be doing something if they had mites not just one. Check the pens for anything sharp that they might be coming into contact with.
There's a 2 month age and size difference. Mom is going to combine everyone, but wants to fix this before- just in case it's some illness. they do have multi-level perches and they all are going up. Mom wondered if it may be a splinter or something like that, but I think she's ruled that out. I'll tell her to recheck for splinters.
I'm for sure ruling out ants. Thanks though