Made a giant desert

so I decided to make a giant desert enclosure for my dinosaurs with all of the dinosaurs being put together to see who manages to survive. I made tree oasis. One for ground herbivores, one for sauropods and one for carnivores. So far most of the original dinosaurs I added have survived besides these ones. :Velociraptors were killed by the troodon army :Gallimimus was killed by Velociraptors :Parasaurolophus was also killed by velociraptors Anyone got ideas for any other ones I should add