I might be in the minority, but I like the inclusion of the Saiga. I like it when DLCs give us the occasional animal that is really challenging to keep in captivity (Saiga, Platypus, Proboscis Monkey, Three-Toed Sloth), it can make for some really interesting exhibits.The bat was WE. A tree roo at WE would be terrible. Saiga and Sloth Bear don t deserve hatred too. They are two visually unique animals that are really neat to the general public.
There's a paper I recommend that delves really deep into the ideal design for a Saiga exhibit, and... Yeah it's a real challenge to make these animals thrive IRL