I haven't heard about the geese issue?? I heard about the deer, but in all honesty, what are their options? They can't release them into the wild. I don't think what they're doing is right, but I can't figure out what else they can do.
Oh, the butterfly exhibit is great! We took loads of pictures. I'll try to post a few for you. They will land right on you, if you hold still long enough.
There are all sorts of butterflies in there, great big ones too! It's right near the main entrance in the Indo-Malayan section, the Malayan Woods exhibit.