This are unfortunate but good points. A desert pack could look like:
- Dromedary
- African spurred tortoise
- Addax
- Hamadrayas baboon
- yellow footed rock wallaby
- collared peccary
- some clone like the arabian oryx
- exhibit
And there's still the porcupine, echidna, perentie, saiga and several more candidates.
But yea we lost quite a few good candidates, but frontier has shown willingnes to put species that don't fit perfectly. Like the red-necked wallaby is not really a grassland-associated animal, yet it made it in.