I was wondering if it was them trying to build a nest or not. (But I have a small hide away for them in case, they don't use it though, at all, I don't know why for that either) What they do is go to the bottom of the cage, grab old feathers and take them up the cage, then do something and drop...

I am very much almost certain that Frost is a recessive pied, but I am not 100% sure because her wings and stripe color throw me off a bit. Loki, I just downright have no clue. I've not seen a picture of any budgie that looks like him that states what kind of color mutation it is. Frost's...