Until its dismantling in 2013, the bird-of-prey aviary was one of the oldest structures in Antwerp Zoo. The steel elements of this structure, designed by Charles Servais and dating from 1856, were originally manufactured using Bessemer steel, which was highly innovative at the time. The structure long served as a reference for numerous European zoos. As zoological insights evolved, the aviary proved no longer suitable for housing birds of prey, which were relocated in 1986 to more spacious enclosures. After years of vacancy, the building was dismantled in order to be reconstructed at another location within the zoo’s new master plan, where it now provides shelter for smaller birds: macaws and cockatoos. Due to severe corrosion, the entire cage structure had to be fully reconstructed. As Bessemer steel is no longer available today, standard structural steel (grades S235 and S355) was used for the reconstruction. Particular attention was paid to the various structural joints, which were redrawn on the basis of historical research, material studies, and photographic documentation of the original (dismantled) aviary. Specific steel components were cast in sand. Visible welded connections were excluded, leading to the development of numerous forged connectors fixed with rivets. The aviary was fabricated in the steel workshop and fully assembled, after which it was divided into four transportable sections and transported for on-site assembly. As smaller birds are now housed in the enclosure, the original bars, initially made of steel rods, were replaced by a fine-mesh steel net installed behind the primary structure.