The bird house and gardens at St. Louis are mostly great, but there are a few enclosures in the house that aren't so great, in particular the Red-Legged Seriema and Bateleur enclosures. Neither of them are very big (but both are certainly larger than a refrigerator).
Let's not mince words: nothing about the bird house is great. San Diego's Scripps Aviary is great. St. Louis' bird house is nice to good at best. The garden is better, but that's not saying a lot. There's only about six large-ish enclosures housing a solitary species in most instances, and most of those are probably too large for the space provided.
And I say this as someone who very much appreciates the ability to get up and close to the various birds in order to observe details.
What? Surely not? I've only ever heard good things about the bird house and garden at St Louis and this doesn't seem to match with those opinions!
I don't have the historical relationship with the zoo that others might, so it might have been better in the past, but the Bateleur habitat is definitely the size of a large fridge. Think of one of those side-by-side Sub Zero models turned sideways, and you have a rough idea of the dimensions. The pair of Toco Toucans had more space.
That's one thing I'm struggling with; if you have a bird house
and a garden then why shove eagles and seriemas inside and not in outdoor enclosures. Neither bird is exactly a delicate little passerine...
The bird garden has the aforementioned six or seven enclosures that, from memory, contained owls and a random kookaburra that had a screen pulled down blocking most of the viewing except he/she was sitting in the upper corner taking in the sun. Otherwise, the recent add-on to the back of the bird house had a bald eagle, a great hornbill (maybe two), and two different species of vultures. These were bigger -- say 12x12x12 -- but hardly the kind of space for truly large birds. The whole thing ends in a covered seating area overlooking cranes adjoined by an incredibly small free-flight aviary with, maybe, six species.
There's a lot to like about the St. Louis Zoo, but to actively campaign, and win, "America's Best Zoo" I expect a lot better. A lot better. The Starbucks and a sweet shop don't quite do it for me.
I like the lemur additions to the primate house, but that's another species being kept outside.