Hello! I have 2 female, unspayed 9 month old rabbits. I just went out to check on them and they did this to their litter box. They have never done this before. What is going on? Today is the first day of spring here so maybe it has something to do with their winter coats? Do they pull that out themselves or does it just fall out? I didn't have any hay in their litter box so they pulled it in there themselves from their hay rack. Thank you for any insight you might have.