For me a perfect and realistic pack would have 16 birds and would be called "Aviary Expansion Pack", because we already have JWE2 dominion expansion. I know jwe2 is not the same as PZ, but you understood me
Aviary Expansion Pack
-Take flight into the air with the new aviary expansion pack! Bring to your zoos 18 feathery friends with new flight behaviours implemented with the Egyptian Fruit Bat, and 3 terrestrial birds very requested by the community. Introducing new aviary modules, with 5 sizes (Small,Medium,Medium-Large,Large,Huge),10 forms (Rectangular, cubic, triangular, spherical, Dome, London zoo-like, septogonal, Octogonal, 9 sides and customizable) With various textures (Mesh,glass, ropes, metal, null). Bring to this new aviary and habitats 18 new animals! Some of them will be in both habitat and aviary. Almost every animal in the game will be able to be in an aviary.
Habitat:
-Emu
-North Island Brown Kiwi
-Secretary Bird
Aviary:
-Blue And Golden Macaw
-Bald Eagle
-Bengal Eagle Owl
-Harris Hawk
-Great White Pelican (able to be outside the aviary but can´t fly)
-Rhinoceros Hornbill
-Toco Tucan
-Mallard (able to be outside the aviary but can´t fly)
-Sulphur-Crested Cockatoo
-Atlantic Puffin (Special aquatic Aviary)
-Scarlet Ibis
-Griffon Vulture
-Rainbow Lorikeet
-African Gray Parrot
-Bali Myna
I would add 5 more small birds like the lovebird, sun conure, cockatiel and blue-fronted amazon, but knowing frontier it would be something like this
And no exotic ducks, just mallard, there is not a single zoo in this entire world without them, i can assure u