I'm still thinking about the difference between "juvenile" and "immature". I would like to hear your opinion on: when is a bird called juvenile, and when immature? Am I correct in thinking, when a bird has the first real feathers it is called a "juvenile", but when it changes into the adult plumage, it would be called "immature"? So the Crimson Rosella in my photo could be called either? He is still moulting into the adult plumage? Then , when it has finished moulting , it is an adult? I'd love to hear what you think.
an interesting discussion, I grappled with this for a while and now use the terms almost interchangeably
Peter