These two particular budgies are a few months old, and still have little stubby wings and tails, and this has caused them not being able to fly. We have ones that are a fair bit younger and they have all their feathers that are strong and long. I have seen these two budgies with one or two tail feathers in at a time, but they soon disappear.
A mate of mine who knows a thing or two about budgies says that I might have something to do with the fact that they are pied, and there have been too many pieds breeding with other pieds.
Is this true, or is there another reason why these two budgies aren't growing their complete feathers?
Thanks.

