I ALWAYS mix the musk ox and the caribou, they just go so well together.
The scimitar horned oryx and dromedary camel go very well together, and I usualluy put an oasis in. I normally add a little burrow in one corner with food next to it for my beloved fennec foxes. :
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The savannah enclosures, I always mix the herbivores, but never the carnivores. A great savannah exhibit for me is:
Greater flamingoes
Thompson's gazzelles
Reticulated giraffe
Common zebra
Giant sable antelope
African elephant (occasionally)
Gemsbok
Ostrich
Black rhinoceros (occasionally)
As for tropical rainforest, I never mix them. (I probably will when i get African Adventure)
Temperate forest..... nope.
Boreal forest I would mix if there were more herbivores to be friends with my moose.
In alpine there is nothing to mix (I don't do mix-continental enclosures)
Grassland, I never mix as there is nothing from the same country.
Scrub is rarely mixed... excpt for that one time I did a Komodo dragon with my tortiose family... (which I regret :pinch: )
Wetlands.... I rarely mix them except for the odd flamingo/hippo enclosure.