A game dynamic that could add more challenge and at the same time require both the aviaries and lagoons to have plants and such in them would be the same requirement you have for the land animals. In the case of the aviaries I would think different flying reptiles would prefer different types of plants, rocks, and trees in their territory. We can decorate the aviary but there is no requirement set for any of the species. The lagoon has no such way currently to even place decorations, so this would be a stretch. As a compromise it has been suggested by many in the community that feeders with various types of living food could be placed in the lagoons. I would take it one step further. In both challenge and chaos, excluding sandbox, there would be territory needs for the marine reptile. Space, type of food source, and if added at some point, aquatic plants. What do you all think?