Need I say more? Come on, cute, and underrated. Platypus all the way!! Oh, and penguins. I am sure that is a big one as well. Maybe make some bigger exhibits so they don't fill up too fast on certain animals. Like, on some of them, 3 is too much?
Platypuses would need a big rethink of some game mechanics. They are only found underwater or underground (their burrows are linked to the water courses) so conventional habitat requirements would not work for them. They would almost be better suited to a form of giant exhibit animal as opposed to a habitat animal. More developments to the exhibit system sounds cool actually.
Chinstrap, little, macaroni or emperor penguins would be a cool addition. Little penguins would be my preferred if I had to pick just one.
