Disappointed with "Boo at the Zoo"

My family goes to the Saint Louis Zoo about once a month and really enjoy it, so we were excited to go to Boo at the Zoo last night with some friends. The park was well-decorated, but we were all very disappointed with the distinct lack of animals. Most of the zoo was closed off with barriers, and the few animals in the open areas were all put away for the night. We spent almost two hours at the zoo and saw exactly two animals: a peacock wandering around, and a bear who was climbing a tree and then put away shortly after. The rest of the exhibits were either closed or vacant.