How come the predators build intergalactic spacecrafts?

Rating: 8/10 (18 July 2004)

I like the movie so much. However, a question concerning the overall logic of the movie has always haunted me: How come predators build intergalactic space crafts when they can't see things in detail as humans do? (they sense beings only through the heat they emit). The predator can't recognize Arnold covered in mud and perceives him as a part of the scenery in the runaway scene. Eventually, how can they build microchips and all the tiny technological stuff when they are literally "half blind"? They travel through the universe at light speed, they reach the earth from a galaxy that is perhaps unidentified by earthlings and they do all these things using super technology space crafts but they can only sense the heat emissions?