Looking at the film again tonight as we've been discussing all these various things - one is required to suspend disbelief a bit as to the Predator's capabilities. I mean how the hell does he get from killing Dillon, to killing Billy and then suddenly appearing in that tree to kill Poncho all within such a short space of time. He's such a big ****er, he doesn't look like he has the kind of body that would enable him to jump from tree to tree - and I certainly doubt he could do it without making a heck of a lot of noise. They'd hear him coming easily. It didn't even look like they were any trees along that 'path' that could support his weight. So it's like he would have moved through the undergrowth on the ground and then quickly climbed up into the tree just to be sneaky.