The preds natural version is thermal vision. It’s just in the first movie the jungle would have been so hot that he needed the computer on his arm to alter the temperature gradients through his mask so it was more obvious. Otherwise everything would be RED, just like when he takes of his mask..
Let me say it in simple terms, walk into a sauna, use heat vision and see how much of it u can make out....
The predators can change between their vision modes, the one in part 2 switches through a few modes when its in the cold storage being attacked by the humans.
Now that i\'ve proved how much of a lame as geek i am, i\'m gonna crawl under a rock now.
