When approaching a hostile dino (one that is not tranquilized nor killed) NEVER use ammo as your first resort. Try to evade them. To do this (this is a tip, not a code), you must try to pass their backside, not their front. After playing this game five times through, I found that the dinos use their bite attack much more then their tail whip attack. So, even if they do use their tail attack, your much better of taking the minimum damage from their tail rather then taking the large amount of damage from their jaws. If you do for some strange reason have to shoot them, don't use ammo first. Use tranquilizers. They allow for no reloading time and they make an instant dino knockout. If your out of tranquilizers (getting down to the nittey grittey here) then use your ammo. But don't use just any ammo. Use SG bullets, they knock the dino down better then any other ammo type (the slag bullets are stronger but don't knock the dino down as fast). Once the dino is knocked down,! run past him before he gets up so you can get past him and not waste tons of ammo! Those are three good ways to not use up your ammo alot. However, the one about using SG bullets only works on raptors and new raptors (the colorful dudes), not on the therizinos (the ones with the huge claws that tried to sqush you with that truck thing. They just don't fall down!). If its a therizino that your that your trying to get past, then I found it best to use tranquilizers or to just run around them. when there about to claw you, run to the side and they'll miss you, then when they're recovering form their attack, you have time you get ahead of them.
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