The ban on the import of wild caught birds on the back of the bird flu panic a few years ago has, possibly, resulted in keeping of more common and reliable bird species. Also a zoo visitor doesn't mind if they see the same animals at every zoo they visit. Not every one has a discerning zoo eye.
In some respects to my miond, it has gone back to the stamp collecting idea of old zoos, but with a subtle twist, if zoo A has a species Zoo B must have it too, etc,etc, the difference now is they have breeding groups of stamps rather than individual ones.
In some respects to my miond, it has gone back to the stamp collecting idea of old zoos, but with a subtle twist, if zoo A has a species Zoo B must have it too, etc,etc, the difference now is they have breeding groups of stamps rather than individual ones.