The first and foremost change is that all players are now alpacas. To differentiate the players, all alpacas have a unique fur color depending on their Minecraft username. The color will always remain the same, and will only change if you change your Minecraft username.
With this mod, come some changes to the hunger system. You can no longer regain hunger bars or saturation by munching on, for example, a steak or a porkchop. In order for your appetite to be sated you must eat entire mobs, not just parts of them. ?So how do I eat mobs??, you may ask. Technically, you don?t You eat their corpses.
Modded or not, whenever a mob dies, they will leave their corpse behind. These corpses despawn after 2 minutes or when you restart your game. Hit the corpse to get rid of it, and it will drop xp like normal. However, if you right-click on it, you eat it, and refill your hunger. Corpses tend to have a darker tint.