I had done oral interviews with animal keepers. So all this history was there and I felt it should be told because it had such a rich history. It was an old zoo. And I wanted to tell this story. And I had two collaborators, Ed Uhlir and Carol Tauber. Ed was, at one time, part of the Park District, architect team and was a friend and colleague. And Carol was our public relations person at one time at the zoo. And we got together and they agreed to help. And we ramrodded this project through, and it took a lot of time, lot of efforts finding the pictures, were so cool.