Ideally, I'd like free-roaming birds of many kinds so that I can create gigantic aviaries.
However, I'm sure that making a flying animal (or one that dives and swims underwater) is harder than making something that walks around like a zebra or a gorilla
While there are many birds that you can get away with spending lots of time on the ground (pheasants, quails, ground hornbills, PENGUINS, secretary birds, seriemas, waders, storks, cranes, herons, kiwis, rarities, guineafowl, turkeys, swamp turkeys, etc.), birds like parrots are so ubiquitous to zoos, to have them left out for the whole lifespan of the game would be weird.
Even for the flying birds mentioned and those already in-game, some flying would be nice. Maybe peafowls can fly into trees while flamingos can go over some fences. In real life zoos, flamingos have the tips of their primary feathers clipped so that they don't fly away without having to build aviaries.
However, I'm sure that making a flying animal (or one that dives and swims underwater) is harder than making something that walks around like a zebra or a gorilla
While there are many birds that you can get away with spending lots of time on the ground (pheasants, quails, ground hornbills, PENGUINS, secretary birds, seriemas, waders, storks, cranes, herons, kiwis, rarities, guineafowl, turkeys, swamp turkeys, etc.), birds like parrots are so ubiquitous to zoos, to have them left out for the whole lifespan of the game would be weird.
Even for the flying birds mentioned and those already in-game, some flying would be nice. Maybe peafowls can fly into trees while flamingos can go over some fences. In real life zoos, flamingos have the tips of their primary feathers clipped so that they don't fly away without having to build aviaries.