If you quickly type DEBUGON during game play, you
cannot be seen or smelled by any dinosaur. If
you get near an herbivore though, it will sense
you and run away (or if it's the triceratops, it
will kill you). This is not an invincibility
cheat, if you shoot at a carnivore and miss, it
will come after you and kill you. Also, this
cheat makes you run REALLY fast and jump VERY
high, giving you some new areas to snipe from...
Such as trees.