Minecraft wiki entry for Advancement_guide, associated text: After the poison wears off, it is time to line them up so you can kill all five with a crossbow shot. It is recommended to lure the animals closer together using their breeding food. Holding different types of breeding food in both hands is also a good option because it will lure more animals toward you (for example, holding a carrot in your off-hand while holding wheat in your main hand, will lure pigs, rabbits, sheep, and cows). Once they are attracted with your food each hand, quickly switch to your crossbow shot and fire the arrow in the best possible angle so that all the mobs die at the same time. It is recommended to aim for the mobs which have the smallest hitbox first, like a chicken or rabbit's, because those are harder to hit, while mobs with larger hitboxes should be prioritized last, like a cow or horse's. If they all die after you fire the arrow, you should be rewarded the advancement.