S.T.A.L.K.E.R.: Shadow of Chernobyl
GSC Game World talked about the game's AI in January 2005. IGN said that the game, while similar to Far Cry, will have more wildlife, and that the way animals act in the game is as important to them as the humans. The animals anger will vary with how hungry and tired they are, as well as other things. So, the game will have some idea of fight or flight to it.