Minecraft wiki entry for Old_Growth_Taiga, associated text: Much as the normal taiga can be considered a colder counterpart of the forest biome, the old growth taigas can be considered a colder counterpart of the jungle biome. Similarly to jungle and dark forest biomes, these biomes generate at very high humidity values and are often surrounded by the regular taiga biome. As with regular taigas, spruce grows all over the landscape, and most of them are the large 2×2 trees that grow significantly taller than regular spruce. Much of the grass blocks are replaced by large swaths of podzol and coarse dirt. Additionally, rocks made of mossy cobblestone frequently generate on the ground and dead bushes generate alongside the sweet berry bushes‌[JE only][1], ferns, large ferns and tall grass on the ground. Wolves, foxes and rabbits‌[JE only] may spawn here. As the climate here is cold, rainfall changes to snowfall above layer 200, though in the old growth spruce taiga variant, snowfall forms at layer 160. Because the snowfall line is so high up, snow rarely forms naturally as these biomes are usually replaced by groves when they generate in mountains or other steep terrain.