This wasn't always the case . . in Qld at least . . where mutations of native species (whether approved for aviculture or not) were fair game
A long time ago a chap I knew took a 'white' (actually very heavily pied) black swan from the wild . . all cosher
But I think things started to get interesting, and he swapped said swan for some 'high-range' parrots, interstate
I believe that offspring off the 'white' bird still exist in a bird park/ zoo in SA
Another tale that comes to mind concerns a parrot keeper (in another state) who explained the presence of some not so cosher birds as being offspring of mutation parents which had died
