Two of the biggest draws of the Detroit Zoo are the polar bear/seal exhibit and the new Polk Penguin Center, both of which feature underwater views of exhibit residents.
We were a bit bummed that the polar bears weren’t swimming while we were there, but we got some great views of the silly seals and swift penguins.
Erin Bartels 
Cool photos! The polar bears were never swimming when I visited that exhibit, either. Lots of other good stuff there, though.