Thank you for your compliment. This was the Atlanta zoo! Also, this is my dilemma...
#4 is a Wreathed Hornbill, but the other three were in a "treehouse" so to speak at the zoo and were able to roam, so they didn't all have identification. I'm going to do some research and I will get back to you.
In the mean time, if anyone wants to take some guesses that would be great too.