Another topic just for me !
Africa
African elephant (the actual one is an asian elephant who doesn’t look like an african elephant). The elephant in RoR is an african elephant.
African buffalo : take the actual buffalo and remove the collar, you have a wild african buffalo.
Giraffe
Hippopotamus
Hyena (spotted)
A gold animal (like the fox)
Panther (no lion in the rainforest and can be used in Asia too)
Gorilla (decorative object)
Madagascar
Here I listed some extinct species who were present in middle age.
Archaeoindris (still alive in middle age see Wikipedia)
Dwarf hippo (Hippopotamus lemerlei and Hippopotamus madagascariensi)
Aepyornis (biggest elephant bird)
Mullerornis (ostrich sized elephant bird)
Fossa (gold animal)
Giant turtle (Aldabrachelys grandidieri) Madagascar and most of the surrounding island were home of giant turtles
Crocodile (Voay robustus, one endemic specie who disappear and was replaced by the Nile crocodile, not necessary to make a new model, the actual crocodile ingame is enough)
Ring-tailed lemur tree (decorative object)
Baobab : Madagascar is home of various baobab species
Mound-building termites : a decorative object useful in Africa, South America and Australia.
Tsingi rock (see here)
Asia
Saiga
Indian rhinoceros : The actual Rhinoceros is an white rhinoceros an african specie. It’s better to represent the indian rhinoceros who have a single horn instead of two (two of the three asian species have a single horn)
Malayan tapir : reskin of the south american tapir
Asian buffalo : reskin of the actual herdable buffalo who are an african buffalo.
America
Beaver, can be as gold animal and as beaver hut decoration, beaver dam destroying building.
Bald eagle (flying bird)
Pronghorn
Ocelot (gold animal, also useful in South America)
American buffalo (the most north american animal)
Caribou seam necessary because there is many scenarios in viking world (Karlsefni, Vinlandsaga) and if they ad a finish civilization one day or a siberian people like the Tsattan (can be played by the mongols) who herd reindeer.
Cougar (useful also in South America)
Beaver hunt (decorative animal with beaver swimming around the hut)
Manatee (decorative animal)
Bald cypress (Taxodium distichum) (If they put a Mississippian civilization, also can be useful in the Drake scenario)
Sequoia
Europe
Reindeer (huntable) Aurochs (aggressive huntable) , european wisent (aggressive huntable)
One type of terrain : Columnar basalt
There is this type of terrain can be used in Ireland, island and any volcanic part of the world (basalt was used in Micronesia to build Nan Madol for example). Can come in various form : terrain, rock, cliff.
Oceania
In Oceania we must have three biome
Australia
Kangarros
Emu
Cassowary is useful as aggressive huntable but with very little range in Australia
Dingo
Tasmanian devil
Thylacine (gold animal) according to recent studies he was not an apex predator like the wolf but an opportunistic predator like the fox
Saltwater crocodile (no alligator here, the biggest species of crocodilian)
Wombat (hare like huntable)
Koala tree (decorative object)
Platypus (water decorative object)
Cockatoo (flying bird)
Australian baobab (Adansonia gregorii)
Bunya-bunya (Araucaria bidwillii)
Eucalyptus
Nothofagus tree
Pandanus (see here , also can be useful in various part of the world)
Wattles tree ( Acacia dealbata)
Tropical Oceania
All Oceania outside Australia and New Zealand
Cassowary (aggressive huntable)
Moa-nalo (chicken like animal)
Feral pig
Tree-kangaroos (huntable)
Saltwater crocodile
Albatross (flying bird)
Frigatebird (Fregata minor or Fregata magnificens) (flying bird)
Flying fox (bat of the genus Pteropus) (flying animal)
Columnar araucaria ( Araucaria columnaris)
Pandanus (see here , also can be useful in various part of the world)
Tree fern (see here) tree fern can be useful in most of the tropical world and in some of the subtropical world like New Zealand)
Corral (new type of stone deposit)
New Zealand
Adzebill (huntable) The second biggest flightless bird specie after the moa (good to not put two species of moa)
Bush moa (little moa) can be avoided and replaced by the adzebil
Giant moa (huntable) If you put one huntable, put the biggest.
Penguin (huntable) already present in the game, make him huntable
Seal (already present in the game)
Kiwi (decorative animal)
Haast eagle (flying bird)
Cordyline australis
Kauri (Agathis australis)
Fern (bush tree) fern are very important in the New Zealand culture
Nothofagus tree
Totara (Podocarpus totara)
Tree fern (see here) tree fern can be useful in most of the tropical world and in some of the subtropical world like New Zealand)
Good idea gaining two resource from one deposit.
Another idea : food and gold animals. Already present but only for the varangians. I propose that the animal who were hunted for their horn and their tusk give also gold in addition of food : Elephant, Rhinoceros, Walrus.