Here I'll explain, the two dossiers that I mention seem to show a survivor gathering oil and water from the creatures. Oil is understandable but water? This suggests that if you are in the desert you can not have access to water, which doesn't seem very possible on the current map unless they made a HUGE expansion which is unlikely.
Oh and that is Rex, or a new desert theropod like an albertosaurus or tarbosaurus. Look closer and you can see its small two fingered arms and large hind legs.