Gardening snails (except they're huge)

I think a giant gardening snail that spawns in caves should be added. I imagine they would be peaceful and only spawn in lush caves and below y0. Small variants (around the size of a Minecraft spider) would spawn in lush caves. And giant variants around the size of an elder gaurdian should spawn below y0.

Snails would be able to eat grass, moss, podzol, and mycelium. When snails ate grass, podzol, or mycelium, it would become dirt. When they ate moss it would become either stone, dirt, grass, sand, gravel, andesite, diorite, or granite.

Big snails would convert grass into moss whenever it would walk on it.