The people in didn't appear to know what the aliens or predators were in Thrill of the Hunt. The Big Deletion occurred one hundred years before Civilized Beasts. Civilized Beats takes place 8 months after Thrill of the Hunt. I don't know exactly when Thrill of the Hunt occurs, only that it takes place after AVP1 movie. However, it is implied in the AVP literature that Thrill of the Hunt takes place very early on. In AVP Prey comic, it is mentioned that the elephant is now extinct. In Aliens DNA War, it is mentioned that the panda bear is extinct. In Aliens No Exit, it is revealed that the cat and the dog had to be "reintroduced" into the human population. Yet in Alien, Jones the cat is there so Aliens No Exit had to have taken place afterward since the general population in that book had a good idea of what the aliens are. So it is implied that many animals have died off and become extinct.