All dates are approximate.
This is the zoo's original map from 1934, which was reprinted in Let the Lions Roar: The History of Brookfield Zoo. This also doubles as the original master plan, as it includes a significant number of exhibits labeled with an asterisk as 'future developments'...
This map is from a guidebook and possibly subject to copyright; if the moderators feel it is safer to delete it, do so, but hoping it is old enough to not be of concern.
A map of the zoo showing the recommended route to take. The route is supposed to take you on an "evolutionary journey", beginning with fish. I did it on reverse as the tropical house was too crowded for my liking.