Ive said this before but the Oceania Pack only has two birds because it was the easiest to do, not because they wanted to add more birds.But here the thing: it's a penguin, no matter what it will always feel like the pack clone instead of the "bird of the pack".
With oceania it's not that unrealistic to receive two birds in a pack anymore, so receiving something like rockhopper and the king eider in a tundra pack is not that unreal. Meaning we can receive a more unique bird while receiving a less unique enough.
Kiwi was a given in a oceania pack and the penguin was chosen because it was an easy to do animal that would be well received anyways. I mean what would be the other options? Tree kangaroo, black swan and echidna are way more work, and most of the other clone ish picks are not that great option either.