The Red Raptor is found at the start of stage 5 and around the middle of stage 8. In both stages, there is a room with Raptor model(s), a cage, and a switch. In stage 5, you have to lure the Red Raptor in by investigating one of the models and the switch. Once he is in the room, lure him under the shadow. When he is under the shadow, shoot at the switch. He will be trapped. He will angrily jump around the cage, but cannot escape. In stage 5, he will knock down some keys.