EDIT: I have edited the previous post - I changed the words "yarn" and "cotton rope" to "preening toys" . I dont want to encourage anyone to use yarn or cotton rope because they can pose problems if the toy is not properly constructed. so my advice is: use a toy, either storebought or DIY, that you know is safe.
I hope Ollie and Harlie are doing better now - and that you've heard back from your vet.
i was thinking about Ollie's situation, and it occurred to me that perhaps what might help, at a purely behavioral level, is if you offer a preening toy as a substitute for his own feathers. basically, target him toward the toy, and then click and treat when he preens it. then retire the target stick, and click and treat, and act very excited, when he preens this toy. hopefully this will redirect his attention to the toy as an enjoyable thing to preen, and he may concentrate less on his own feathers. for Ringo I had to hang preening toys all over the house in all his favorite stations, to encourage him not to preen himself when he was out of the cage. it was very disturbing to watch how aggressively he would preen when he wasnt in the cage, when he didnt have his favorite preening toy from the cage. so to deal with this, i put up other preening toys basically everywhere i could think of, and it basically kept his beak off his feathers.
as for Harlie, she might copy Ollie, as he clearly is dominant, so it would be worth it to train Ollie in her presence, and then train her to do the same thing.
this might help at a behavioral level to save their feathers. i do hope they are medically alright, and that these behavioral issues pass. my best wishes for you, Ollie, and Harlie during this difficult time!




