If anyone's an expert on birds here's some ideas for mixed aviaries I wondered if was possible:
Japan - Crested Ibis, Chinese Egret, Mandarin Duck, Common Eider, Ruddy Shelduck and Pied Avocet.
New Zealand - White-faced heron, Royal Spoonbill, Black Swan, Blue Duck, Paradise Shelduck, New Zealand Scaup, Weka, Red-necked Avocet, Black Stilt and South Island Takahe.
Japan - Crested Ibis, Chinese Egret, Mandarin Duck, Common Eider, Ruddy Shelduck and Pied Avocet.
New Zealand - White-faced heron, Royal Spoonbill, Black Swan, Blue Duck, Paradise Shelduck, New Zealand Scaup, Weka, Red-necked Avocet, Black Stilt and South Island Takahe.