Same here, but June 2022 is something I look at too.I doubt this will be the last year of Planet Zoo, but I don't expect things to carry on past Dec 2022
In any case, that would be 2,5-3 years support - which I consider a long support in DLC.
They could easily push out DLC for 5 years content-wise but I wonder if the game remains that popular. (will it be profitable enough?)
Could be an option but still a doubt if an Aviary pack will be a november/december DLC1. Africa
2. North America
3. Birds at the end of the year just as with Aquatic pack