I figured I would do this as well. As well as the pack title, release dates and animals (including habitats, status and some real zoo holdings) I figured I would also include a short section on what else is included in the packs:
2020:
Australia Pack
This pack has less building pieces, having mostly copies of rock artwork and bronze statues of Australian marsupials (similar to what exists at San Diego Safari Park); it also has a large number of new foliage types and enrichment items.
Brush tailed rock wallaby - Desert-Temperate, Vulnerable (kept in at least 4 Australian collections)
Emu - Desert-Grassland, Least Concern (kept in 551 European collections)
Queensland koala - Temperate, Vulnerable (kept in 12 European collections)
Red kangaroo - Desert-Grassland, Least Concern (kept in 91 European collections)
Frilled lizard - Tropical-Grassland, Data Deficient (kept in 99 European collections)
North America Pack
This pack includes new North American foliage, new enrichment and a new campaign, where visitors have to convert an abandoned alligator farm into a thriving zoo, while also treating the injured alligators already living on-site.
American alligator - Aquatic-Tropical-Grassland, Least Concern (kept in 89 European collections)
Desert cottontail - Desert-Grassland, Least Concern (kept in 5 American collections)
Florida panther - Tropical-Grassland-Temperate, Critically Endangered (kept in at least 4 American collections)
Musk oxen - Tundra, Least Concern (kept in 27 European collections)
2021:
Europe Pack
Because Europe already has representation from the building packs, there will be no actual building pieces although new information boards and other auxiliary theming will be included; this pack will also include a range of new European plants and a couple of enrichment items.
Alpine marmot - Grassland-Tundra, Least Concern (kept in 59 European collections)
European red fox - Temperate-Grassland-Taiga-Tundra, Least Concern (kept in 182 European collections)
Great white pelican - Aquatic-Grassland-Temperate-Tropical, Least Concern (kept in 217 European collections)
Red deer - Temperate-Grassland-Taiga, Least Concern (kept in 306 European collections)
Ocellated lizard - Temperate-Grassland-Desert, Near Threatened (kept in 46 European collections)
Asia Pack
This pack does not include a building theme as there are other themes (Indian, East Asian) that already match this continent; there will be new foliage types, new enrichment objects and new types of fencing (such as zoomesh and harp wire).
Blackbuck - Grassland-Desert, Least Concern (kept in 109 European collections)
Goliath heron - Aquatic-Tropical-Grassland, Least Concern (kept in 13 European collections)
Persian leopard - Temperate-Taiga-Grassland-Desert, Endangered (kept in 40 European collections)
Sulawesi bear cuscus - Tropical, Vulnerable (kept in 3 European collections)
Veiled chameleon - Tropical-Grassland, Least Concern (kept in 191 European collections)
Mesoamerica Pack
This pack would include new foliage and enrichment as well as a new campaign where a small Central American zoo at risk of folding has to be brought back and become a profitable park; along the way the zoo will receive rescued native species that need to be rehabilitated.
Geoffroy's spider monkey - Tropical, Endangered (kept in 10 European collections)
Morelet's crocodile - Aquatic-Tropical-Grassland, Least Concern (kept in 20 European collections)
Ocellated turkey - Tropical-Temperate, Near Threatened (kept in 13 European collections)
White lipped peccary - Tropical-Grassland-Temperate, Vulnerable (kept in 9 European collections)
Africa Pack
This pack has no building pieces; instead it includes plants from three main regions (savannah-woodlands, the Congo Basin and the Karoo/fynbos) that encompass the areas the new animals inhabit and some enrichment items; two exhibit animals will be included in this pack.
Black-footed cat - Desert-Grassland, Vulnerable (kept in at least 8 American collections)
Eastern black rhinoceros - Grassland-Desert, Critically Endangered (kept in 22 European collections)
Grey crowned crane - Aquatic-Grassland-Tropical, Endangered (kept in 163 European collections)
Red capped mangabey - Tropical, Endangered (kept in European 19 collections)
Pancake tortoise - Grassland-Desert, Critically Endangered (kept in 80 European collections)
Turquoise dwarf gecko - Tropical, Critically Endangered (kept in 47 European collections)
2022:
Mediterranean Pack
This pack includes some Mediterranean building pieces such as mosaic tiles and hieroglyphic letters, new foliage and enrichment items and a new campaign, where a conservation centre for Mediterranean species is built in ancient ruins - they are listed, and cannot be destroyed or moved in any way.
Apennine chamois - Grassland-Temperate-Tundra, Vulnerable (kept in 2 European collections)
Egyptian goose - Aquatic-Grassland-Tropical-Desert-Temperate, Least Concern (kept in 167 European collections)
Indian porcupine - Grassland-Desert-Tropical-Temperate, Least Concern (kept in 246 European collections)
Striped hyena - Desert-Grassland-Temperate-Tropical, Near Threatened (kept in 37 European collections)
Leopard snake - Grassland-Desert-Temperate, Least Concern (kept in 11 European collections)
Nightlife Pack
This pack is reserved for smaller nocturnal animals that can nonetheless be kept in outdoor enclosures - all of these animals will have small enclosure requirements so they may be kept indoors; there is also a building set for nocturnal houses, some new foliage and new enrichment items.
Goodfellow's tree kangaroo - Tropical, Endangered (kept in 11 European collections)
Owston's civet - Tropical-Temperate, Endangered (kept in 5 European collections)
Southern springhare - Grassland-Desert, Least Concern (kept in 5 European collections)
Yellow armadillo - Grassland-Tropical, Least Concern (kept in 62 European collections)
Coconut crab - Tropical, Data Deficient (kept in at least 3 European collections)
Bird Garden Pack
This pack contains four non-flying habitat birds, a building set that allows players to create mesh or wire roofs for enclosures (useful for birds, primates and cats, among other animals) as well as the standard new foliage and enrichment items.
European white stork - Temperate-Grassland-Tropical, Least Concern (kept in 459 European collections)
Giant wood rail - Tropical-Aquatic-Grassland, Least Concern (kept in 49 European collections)
Southern ground hornbill - Grassland, Vulnerable (kept in 92 European collections)
Victoria crowned pigeon - Tropical, Near Threatened (kept in 79 European collections)
Endangered Animals Pack
The last pack has a building set of traditional 'functional' zoo fencing, new enrichment, a selection of critically endangered plant species and a new campaign, to build on a fairly small footprint a successful zoo only housing species with a threat status of Endangered or higher.
Coquerel's sifaka - Tropical-Temperate, Endangered (kept in at least 13 American collections)
Iberian lynx - Temperate-Grassland, Endangered (kept in 4 European collections)
Northern helmeted curassow - Tropical, Endangered (kept in 56 European collections)
Przewalski's horse - Grassland-Desert-Tundra, Endangered (kept in 100 European collections)
Desertas wolf spider - Desert, Critically Endangered (kept in 11 European collections)
I think Manatees could already work in the Game (not perfect but relatively good. We would need a Animation for them to swim to the Surface to breathe) . I think they move a lot along the Ground and the Hippos already do this