Minecraft wiki entry for Gathering_resources_on_peaceful_difficulty, associated text: Bees are the only arthropod mobs that don't despawn in peaceful. Bees only drop experience when killed, so it's better to farm them to produce honeycombs or honey bottles. These items can be used as food (honey bottles also remove poison), to craft honeycomb blocks, sugar, honey blocks (a sticky block similar to slime block but different), or to craft beehives.