A cool way to identify the overworld biome in the Lush Caves

My idea is that in the Lush caves, you can identify what biome is in the Overworld thanks to the butterfly, a new mob that, depending on the biome, would spawn with a specific color. For example, in forests they could be red while in swamps purple or dark green. They would also serve to add variety to the caves, and you could feed them using the new Glowberries, giving these a new purpose.