By the time this pack comes out it would have been a year since the walkthrough exhibits were presented to the community. 12 months since the bats, 4 DLCS where people were hoping and expecting to finally seeing flying birds even with the exhibit limitations AND nothing. It's been drawn out long enough.
So now even if there was an Aviary Scenery Pack, nobody is going to be happy with the selection of birds, 8 birds simply won't cut it.
So i'm thinking with this being the autumn pack, on the anniversary of the base game. Leading up to the festive period, the next pack would be the ideal time to add an Expansion to the game rather than a DLC. and cancelling PZ for PZ2 reboot would backfire big time - that needs a good long break so not to annoy the current players. I don't want to start all over again just to get a slightly better lion model.
So maybe it's time for a bigger £20+ pack with a new aviary feature and trading market with a few habitat additions as well. An Aviary Expansion / Building Pack if you will that comes with all the pieces build aviaries and birdkeepers who can enter a backstage area of the aviaries. Frontier knows that birds collectively are the #1 craving in the community and monkeys would be #2. And if they want to milk that craving for money it should be in the coming autumn otherwise it's just going to go sour big time. Birds and Monkeys must be being held back for a reason
So my elaborate current speculation / theory / pipedream is an Aviary Building Expansion Pack with a mixture of habitat birds, aviary birds with and/or walkthrough exhibit options with a roster of about 40+ with notable absences for further packs (like snowy owl for tundra or hornbill for rainforest). Nesting behaviors as a new feature etc.
Shoebill, Crowned Crane, Secretary Bird, Pelican, White Stork, Rockhopper Penguin, Mute Swan, 5 Waterfowl, Guineafowl, Kookaburra, 5 x Parrots, Toucan, 2 Pheasants and a partridge, 2 ibis, spoonbill, 2 owls, 2 falcons, 3 eagles, and 2 vultures, rainbow parakeets and budgies and numerous songbirds both brown and colourful