You don't even have to go back that far. Back in the 80s they had animals still housed in small cages. When you went across the bridge and turned right, there as a set of cages where Grizzlies, the Lions, wolves, and other poor animals were housed in the smallest of cages.
Even the Polar Bear complex was there in the 90s when I worked at the zoo, and it was eventually considered a terrible habitat for the bears.
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