...while simultanously exemplifiying the Dunning-kruger effect.
Just to give the rarity of hummingbirds an European perspective (apart from the private sector): according to ZTL, we only have six zoos in Europe currently keeping hummingbirds, of which only half keep more than one species. And asfaik, none of them has an outdoor walkthrough aviary with at least one hummingbird species. I remember at least one South American walkthrough exhibit for butterflies and hummingbirds being mentioned years ago in another thread (and there might be more), but all in all, outdoor walkthrough aviaries with hummingbirds are indeed a rare commodity in zoos.