We were members of Brookfield Zoo; knew it VERY well!
Also the Lincoln Park Zoo.
And I still have friends there.
But dying the Chicago River Green always was and still is VILE! :-)
Visited Chicago once in December, freezing cold……I remember Lake Michigan was partly frozen…….but worth it to see the Field Museum
As a Floridian it was pretty memorable…….l could not get warm…….the plane for home kept de-icing forever