How about a duck for every pack then to prove my point?
As criteria all ducks need to look visually distinct, have a decent zoo holding (20+ atleast)
Arcitc: Common Eider, 69 EAZA Holdings, Northern Coasts of North American, European and East Asian
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South Ameirca: Red Shoveler, 32 EAZA Holdings, from Southern Brazil down to the Tip of South America and even the Falkland Isles
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Australia: Australian Wood Duck, 62 EAZA Holdings, Most of Australia and Tasmania
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Aquatic: Mallard Duck, 290 EAZA holdings (eventhough if you count wild ones propaply hundreds more), everywhere the red fox went, these guys went aswell, very weirdly similar ranges
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South East Asia: Phillipene Duck, 28 EAZA Holdings, Vulnerable, Phillipenes
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Africa: White Faced Whistling Duck, 166 EAZA Holdings, Africa, South America, Madagascar
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North America: Wood Duck, 359 EAZA Holdings, Most of Temperate North America
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Europe: Eurasian Teal, 87 EAZA holdings, All of Europe, northern non Tundra Asia, Mainland SEA and India, North Africa, all along the Nile and really this duck is nuts
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Conservation: Laysan Duck, 28 Eaza holdings, critically endangered, Northwestern Hawaiian Islands
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Grasslands: Eurasian Wigeon, 102 EAZA holdings, Northern Eurasia, Sprinkled across all of the old world and even some spots in northamerica with the most notably being japan, china, india, the nile, a large part of the sahel, europe and the northern phillipenes.
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First 10 are here, twillight pack is the only actual deal breaker cause there are no mainly nocturnal duck atleast not after 15 minutes of google searches.
For the wetland packs i wanna hear, what non mentioned duck would you guys like to have?