@Blackduiker: since your visit in 1996 there have been loads of new exhibits: Jaguar Cove, Humboldt penguins, komodo dragons, African wild dogs, flamingos, Bugworld, African Village, Zoomazium, etc. Come back anytime!
This information is extrapolated from some information pulled off of the Woodland Park Zoo's website and mixed with a little bit of personal memory, so I make no claims as to its current accuracy, but the species list is something like this:
Green heron
Black-crowned night heron
North American wood duck
Pintail
Bufflehead duck
Smew
Hooded merganser