📜 Historic 1904 World's Fair Flight Cage, now a permanent fixture at the St. Louis Zoo. 🔍 One of the world's largest free-flight aviaries, home to over 20 species of birds year-round. # Why Go 🦅 Observe over 20 species of birds, including roseate spoonbills and snowy egrets 🌿 Experience a lush, verdant swamp ecosystem 🚶 Explore winding paths and a floating bridge within the massive historic aviary 📚 Learn from educational exhibits on conservation 🏛️ Visit a monument from the 1904 World's Fair # Hours 🕒 Open year-round.