These are the current interspecies enrichment bonus groups I currently found on all packs. At the beginning, all species in the group used to enrich each other, but now, only a certain combinations work. Look at the list and feel free to express your opinions!
Aardvark&Meerkat
African Buffalo&Black Wildebeest&Common Ostrich&Common Warthog&Plains Zebra&Reticulated Giraffe&Sable Antelope&Springbok&Thomson's Gazelle
African Buffalo&Black Wildebeest&Common Ostrich&Plains Zebra&Reticulated Giraffe&Sable Antelope&Southern White Rhinoceros&Springbok&Thomson's Gazelle
African Buffalo&Common Ostrich&Nile Lechwe&Reticulated Giraffe
African Buffalo&Common Ostrich&Plains Zebra&Reticulated Giraffe&Scimitar-Horned Oryx
Nyala&Southern White Rhinoceros
American Bison&Black-Tailed Prairie Dog
American Bison&Pronghorn Antelope
Asian Small-Clawed Otter&Binturong&Malayan Tapir
Asian Small-Clawed Otter&Bornean Orangutan&Malayan Tapir
Asian Small-Clawed Otter&Indian Rhinoceros
Asian Small-Clawed Otter&Malayan Tapir&Proboscis Monkey
Binturong&Sun Bear
Bornean Orangutan&Siamang
Indian Elephant&Malayan Tapir&Proboscis Monkey
Indian Rhinoceros&Wild Water Buffalo
Malayan Tapir&Wild Water Buffalo
Bactrian Camel&Przewalski's Horse
Baird's Tapir&Capybara&Colombian White-Faced Capuchin Monkey&Giant Anteater
Capybara&Galapagos Giant Tortoise
Capybara&Llama
Black-And-White Ruffed Lemur&Red Ruffed Lemur&Ring-Tailed Lemur
Japanese Macaque&Red-Crowned Crane
Koala&Red Kangaroo
To me, Bactrian Camel&Przewalski's Horse and Koala&Red Kangaroo make the least sense because the animals in the group do not share any biome although they share at least the same continent!!!
Aardvark&Meerkat
African Buffalo&Black Wildebeest&Common Ostrich&Common Warthog&Plains Zebra&Reticulated Giraffe&Sable Antelope&Springbok&Thomson's Gazelle
African Buffalo&Black Wildebeest&Common Ostrich&Plains Zebra&Reticulated Giraffe&Sable Antelope&Southern White Rhinoceros&Springbok&Thomson's Gazelle
African Buffalo&Common Ostrich&Nile Lechwe&Reticulated Giraffe
African Buffalo&Common Ostrich&Plains Zebra&Reticulated Giraffe&Scimitar-Horned Oryx
Nyala&Southern White Rhinoceros
American Bison&Black-Tailed Prairie Dog
American Bison&Pronghorn Antelope
Asian Small-Clawed Otter&Binturong&Malayan Tapir
Asian Small-Clawed Otter&Bornean Orangutan&Malayan Tapir
Asian Small-Clawed Otter&Indian Rhinoceros
Asian Small-Clawed Otter&Malayan Tapir&Proboscis Monkey
Binturong&Sun Bear
Bornean Orangutan&Siamang
Indian Elephant&Malayan Tapir&Proboscis Monkey
Indian Rhinoceros&Wild Water Buffalo
Malayan Tapir&Wild Water Buffalo
Bactrian Camel&Przewalski's Horse
Baird's Tapir&Capybara&Colombian White-Faced Capuchin Monkey&Giant Anteater
Capybara&Galapagos Giant Tortoise
Capybara&Llama
Black-And-White Ruffed Lemur&Red Ruffed Lemur&Ring-Tailed Lemur
Japanese Macaque&Red-Crowned Crane
Koala&Red Kangaroo
To me, Bactrian Camel&Przewalski's Horse and Koala&Red Kangaroo make the least sense because the animals in the group do not share any biome although they share at least the same continent!!!