Seriously?Well there was only ONE Arctic pack.
ONE South America pack.
ONE Australia pack.
ONE Southeast Asia pack.
ONE Africa pack.
ONE Aquatic pack.
ONE North America pack.
But there is "no reason to think the [Bird pack] would be the only pack with birds."
Yes
I'm not good at math...but I think I just counted seven reasons so far to believe we aren't getting multiple Bird packs
have there been additional animals released corresponding to each pack?
Arctic pack. YES
South America pack. YES
Aquatic pack. YES