Minecraft wiki entry for Mushroom_Fields, associated text: The mushroom fields generate in usually flat islands and have mycelium instead of grass blocks on the surface. Grass blocks that are placed by the player in this biome take on a bright green color, similar to the grass found in jungles. A large amount of brown and red mushrooms cover the land. It is one of the only biomes, along with swamps‌[Bedrock Edition only] and dark forests, where huge mushrooms generate naturally. The mushrooms generate as trees with a density high enough to be a reliable source of mushroom blocks, but low enough not to significantly obstruct vision. Here, mushrooms can grow in full sunlight. Water is a light gray color in Bedrock Edition. This is the only biome where mooshrooms naturally spawn. Red mooshrooms and bats‌[JE only] are the only mobs that spawn naturally in this biome, along with the rare brown mooshroom; this also applies in caves, mineshafts, and other dark structures under the island, meaning the biome is mostly safe. However, spawners (found in mineshafts, dungeons, or strongholds) still spawn mobs, raids still can spawn illagers, wandering traders along with trader llamas can still spawn here, and the player can still breed animals, use a fish bucket to spawn fish, and spawn mobs using spawn eggs. Additionally, lightning strikes in this biome still carry the small chance of spawning skeleton traps, and can transform red mooshrooms into brown mooshrooms or vice versa. If the player hasn't slept in three nights, phantoms spawn as soon as the player is no longer within the biome at night.