We're assuming scenery packs stay scenery packs and animal packs stay animal packs and replacements should obviously fit the pack of the animal it is replacing! Assume the timeline of all in game mechanics and updates remain the same. For me, my answers would be:
Base Game (most of these are just about diversity for modders so they have more unique rigs to work with, but also why do we not have a damn Leopard in the base game):
Aldabra Giant Tortoise - African Leopard (sorry, I don't really care for Tortoises)
Black Wildebeest - Blue Wildebeest (sorry, I don't care about the Black Wildebeest)
Greater Flamingo - American or Chilean Flamingo (duh)
Grizzly Bear - Brown Bear (with all the subspecies as colourmorphs so you can choose what kind of wolf you want in your zoo)
Himalayan Brown Bear - Takin/Goral/Mountain Goat/Spectacled Bear
Nile Monitor - Asian Water Monitor (sorry, I also don't care about the Nile Monitor)
Red Ruffed Lemur - Indri or one of the Sifaka
Sable Antelope - Thomson's Gazelle
Timber Wolf - Grey Wolf (with all the subspecies as colourmorphs so you can choose what kind of wolf you want in your zoo)
2nd Anniversary
- Black and White Ruffed Lemur - a monkey instead
3rd Anniversary
- Red Deer - Let's put the Spectacled Caiman here instead
Deluxe Upgrade Pack
- Literally anything cool and preferably endangered to replace the Thomson's Gazelle
Arctic Pack
South America Pack
Aquatic Pack
North American Animal Pack
Europe Pack
Wetlands Animal Pack
Conservation Pack
- Siamang - Literally any endangered bird or reptile or Golden Lion Tamarin (sorry to the Siamangs)
Twilight Pack (Sorry to this pack but I feel like most of these animals were just eh)
Grasslands Animal Pack
Tropical Pack
Arid Animal Pack
Oceania Pack
P.S. I'm ignoring most of the exhibit animals, except the walkthroughs cause I don't really care for them but if you do, go ahead if you would replace any of them!
Base Game (most of these are just about diversity for modders so they have more unique rigs to work with, but also why do we not have a damn Leopard in the base game):
Aldabra Giant Tortoise - African Leopard (sorry, I don't really care for Tortoises)
Black Wildebeest - Blue Wildebeest (sorry, I don't care about the Black Wildebeest)
Greater Flamingo - American or Chilean Flamingo (duh)
Grizzly Bear - Brown Bear (with all the subspecies as colourmorphs so you can choose what kind of wolf you want in your zoo)
Himalayan Brown Bear - Takin/Goral/Mountain Goat/Spectacled Bear
Nile Monitor - Asian Water Monitor (sorry, I also don't care about the Nile Monitor)
Red Ruffed Lemur - Indri or one of the Sifaka
Sable Antelope - Thomson's Gazelle
Timber Wolf - Grey Wolf (with all the subspecies as colourmorphs so you can choose what kind of wolf you want in your zoo)
2nd Anniversary
- Black and White Ruffed Lemur - a monkey instead
3rd Anniversary
- Red Deer - Let's put the Spectacled Caiman here instead
Deluxe Upgrade Pack
- Literally anything cool and preferably endangered to replace the Thomson's Gazelle
Arctic Pack
- Arctic Wolf - Arctic Fox
- Dall Sheep - Muskox
South America Pack
- Colombian White-Faced Capuchin Monkey - A spider monkey, squirrel monkey or a howler instead, though it's fine too
- Llama - Guanaco/Capybara
- Giant Anteater - Giant Otter
Aquatic Pack
- Giant Otter - Sea Otter
- Grey Seal - Walrus? If not, Mediterranean Monk Seal, Harp Seal or Ringed Seal (sorry, Grey Seal)
- Dwarf Caiman - Any sea turtle instead
North American Animal Pack
- Arctic Fox - Wolverine
- Moose - American Black Bear/Bighorn Sheep
Europe Pack
- Alpine Ibex - Chamois/Alpine Marmot
- European Fallow Deer - Red Deer/Roe Deer
- European Badger - Moose
Wetlands Animal Pack
- Asian Small-Clawed Otter - North American River Otter/Giant Otter? (though I love the Asian Small-Clawed Otter too)
- Capybara - One of the swans (my favourites are Trumpeter Swans!)
- Spectacled Caiman - Alligator Snapping Turtle? Or literally any freshwater turtle
Conservation Pack
- Siamang - Literally any endangered bird or reptile or Golden Lion Tamarin (sorry to the Siamangs)
Twilight Pack (Sorry to this pack but I feel like most of these animals were just eh)
- Raccoon - Kinkajou/Ringtail (African Leopard if they didn't want to put it in the base game)
- Red Fox - A civet or genet
- Common Wombat - This one was fine but maybe a hedgehog or even the Spectacled Bear
- Striped Skunk - Aye aye/one of the lorises/one of the tarsiers/one of the galagos
- Egyptian Fruit Bat - Also fine, but could have been an opportunity to add owls?
Grasslands Animal Pack
- Nine-Banded Armadillo - Greater Rhea?/A bustard
- Blue Wildebeest - Giant Anteater
Tropical Pack
- Asian Water Monitor - Margay/Ocelot or an anaconda
- Red River Hog - Coati/Toucan (they don't fly much so they could be mostly climbing with some fluttering between trees animations or something? That can't be too difficult, right?)
Arid Animal Pack
- Dromedary Camel - Burrowing Owl/Roadrunner
- Sand Cat - Honey Badger
Oceania Pack
- Little Penguin - Nene (Hawaiian Goose)/Kakapo (sorry to the little penguin)
- Quokka - Goodfellow's Tree Kangaroo
P.S. I'm ignoring most of the exhibit animals, except the walkthroughs cause I don't really care for them but if you do, go ahead if you would replace any of them!
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