There are pigs everywhere. Try near the first radio tower you clear right at the start of the game.
Thanks for that
Tip for someone starting out - save up your skill points until you have visited the Temple. And you get 1500 XP taking down an outpost by stealth and 500 by storming in - it's definitely worth doing the former, just use rock throwing to pull each bad guy out of position until you can backstab him where he won't be seen by the others.
Where on earth do I find pigs? I want to increase my rucksack size but can also see boars on the map. Beautiful game, it's rare that I find myself wanting to play again so soon. It's stunning too.