Add a cluckshroom to the mod.

It is a chicken like mob that leave a trail of mushrooms when it walks in the dark. They seek dark areas.
If a cluckshroom is under direct sunlight, it runs around wildly until it is out of the sun.

• https://minecraft.gamepedia.com/Minecraft_Earth:Cluckshroom
• see also the Earth Mobs mod https://github.com/baguchan/EarthMobs
  https://www.curseforge.com/minecraft/mc-mods/earth-mobs
• https://www.curseforge.com/minecraft/mc-mods/minecraft-earth-mod