In the game, on the levels where you confront a Velociraptor, there is a glitch in the game. To take of advantage of it, all you have to do is simply break eye contact for a few seconds and it will go away. You could be standing right next to it and if it doesn't see you it won't eat you. This is very helpful if you run out of ammo, or if you want to use hit and run tactics with spears to save ammo.