These Storks live in a free-flight aviary, along with many other birds, while the ground level is occupied by large mammals : Nile Hippos, Nyalas and Red River Hogs.
The Abdim's Storks breed easily in this aviary.
Nice photo! Thank you for providing the extra detail in your photo captions! This sounds like an impressive aviary with the storks, Nyala, and other African species. I'm happy to hear that the storks are raising young with no trouble!