Penguins are not that rarly keept in walk troughs. Here is me in Naturzoo RheinePenguins perhaps? I’ve heard they can be really feisty if you spook them. Another one might be gulls or cranes and storks. Geese could also be another bird that isn’t fit for walkthrough aviaries due to their aggression.
I saw a few walkr trough exhibits with storks, like in Rheine or Cologne. Cranes, I never saw in a classical walk trough, but pinned in the park area next to the visitors.
Gulls are sometimes kept in penguin walktroughs