This is not how a world class zoo like Beauval should keep their birds. This is indeed exactly what I had in mind. I can see the point that birds that are able to flap their wings in the flight show might cope with a smaller aviary (although I do not necessarily agree with it), but these are downright tiny.
And yet most of the zoos have off-show areas for birds, where the cages aren't much bigger. Off shows are first and foremost about functionality, not appearance. That 2x2x2 cubic cages are pretty much standard thing...The smaller one in the middle (2x2x1) is not probably ok, but as a temporary solution, it can work.
That wasn't my question: I've visited and seen the show, I know generally which species make an appearance. Earlier (post #17) you mentioned that all species had an on-show enclosure, which I don't think is true.
Yeah, I can't imagine either that they are moving 50 or so birds from and back to exhibit every day.