GTT could be considered a Zoo,,,,sometimes.I saw Black Bear when I was in Alaska. They were feasting on Salmon that had gone upstream and finished spawning. Gorgeous creatures. I never felt unsafe around them, but also did not get near the mom with her cubs. I just retreated the same way that I had walked into the area, calmly.
I can't recall ever seeing Bear anywhere else live and up close, unless you want to consider a zoo.