Far Cry 3 - Skill Tattoos

As you complete various objectives in the game, you will earn XP. This will come from killing enemies, getting collectibles and other things. At the end of Harvest the Jungle, you are introduced to skills and will have to learn two of them on the spot. There are three separate skill trees, called The Heron, The Shark and The Spider. Each of these specialize in certain things, and some skills won't unlock until you have performed specific actions in the game.