Boars can be found everywhere in Rust. For now you can get Raw Chicken Breast and Cloth from them. The total amount of loot from a Boar is 10 Raw Chicken Breast and 10 Cloth. If you sprint up to them they will notice you and run away. They do not attack you, even if you attacked them to get their flesh.
In other versions you can only get Raw Chicken Breast from them