Okay, now I guess I can take a crack at it:
The predator homeworld must be one of dense, lush jungles, sheer, abundant cliffs, and thick forests. The temperature on the planet has to be extremely low, otherwise the predator's viewing of heat signatures is completely pointless.
Based on their structuring, I would say that open areas must exist here and there, otherwise the predator's bipedal movement is pointless: creatures become bipedal so they can gain a better view of their surroundings. In dense areas, this adaptation is pointless.
It is also obvious that the predator's homeworld must have a high abundance of organic (and mobile) wildlife, otherwise the ability to view heat would be pointless yet again.
Based on their thick, heavy brows, it can also be theorized that the sunlight, while not warming to the planet, is extremely bright. Their skulls (and brows) would slope as they do to sheild this sunlight from their heat-sensitive eyes.
Finally, based upon all this information, as well as the fact that they possess sharp claws and thick, ridged flesh, it is highly likely that predators exist in a region that is a combination between dense undergrowth and flatlands. Their claws would be extremely helpful for running, and their tentacle-like hair and thick skin would prevent their bodies from being damaged while stalking through the flora.
"If anything in this life is certain, if history has taught us anything, it is that you can kill anyone." - Michael Corleone