S.T.A.L.K.E.R.: Call of Pripyat Trailer Takes a Tour

I picked up the original on Steam a while back for 5 bucks and just played it last night for the first time. The graphics, at first, seemed aged but still solid, and the flashlight effects are some of the best, if not the best I've seen. I randomly went into the Fallout 3-esque wilderness and camped out on an overpass, looking at the vast field below with pockets of radiation a few hundred yards out all over the entrance to some woods.

I was looking down with binocs at a Stalker corpse below when a pack of 4 or 5 dogs went up to the body and started eating it. Suddenly, three huge mutated warthog looking things came galloping out of the woods at full clip, and an epic battle ensued over the dead body. The dogs broke off and routed the warthogs, while one of them hung back and dragged the corpse by the arm underneath the overpass to hide it. Now that is some impressive AI.