Little Bird with a yellow bill...

My dad, of all people, taught me the first part of that rhyme, and while neither appropriate or even relevant, I couldn't think of any other title...

One of the better zoos in the US is the Arizona-Sonora Desert Museum. It doesn't even sound like a zoo from the title, but the reason it stands out over any of the others is that its an outdoor zoo where the all the animals are contained in "natural" environments. These are just enclosed areas of the actual landscape, so the animals appear like they are right next to you.

In addition they also have a resident family of Harris Hawks (I'll post some pictures later), that fly in and are fed twice a day, and a walk in greenhouse full of hummingbirds. You can walk right up to them and watch them feed and sit on eggs.