Also, please keep in mind that this is my interpretation of the creatures based on my recollection of the movies and comics, with a little insight from the web. This predator is considered an "average" adult predator. If you decide to use the predators in your game customize them as you see fit.
Feared by those who know of their existence predators (otherwise known as yautja or hish) are a race of intergalactic hunters. The most common varieties, known as hunters are honorable, but deadly warriors. They believe it is an honor to face a worthy opponent on equal ground. To them the kill is just the end result, the hunt is what is important. Because of this they will ignore the young, weak, and infirm. Their hunting tactics will vary, based on their prey. It should be noted that occasionally a predator will go rogue. These "killers" relish the act of slaughter.
Predator - Blooded Hunter
[Note that these items could potentially fall into the hands of your players once the predator is defeated. How you handle that is up to you.]
I was just looking over my blog list and found this recent pic from Super-Team Family.