Housing the zoo's collection of South American ducks - Chiloe wigeon, yellow-billed teal, crested duck, and rosy-billed pochard - as well as one Eurasian species, the common shelduck. Mallards are also signed though I don't know if those are captive birds or wild birds.
Part of the exhibit is walkthrough, but the part on this photo is a designated "safe space" that can't be accessed by the guests.
