Couple of things that would make these guys more intresting in my opinion would be:

1) Ability to walk around
This would make these creatures 100% more intresting and believable then they are right now, especially Pterosaurs and the Quetz.

2) Taller aviary domes
It always feels like the Quetzalcoatlus doesn't have enought vertical space in their enclosure. Not to mention how janky the flying animations are whenever they fly inside the cage. I the solution would be to have anothe type of dome that is bigger and taller.
 
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