Old Growth Taiga

Old growth taigas are cold forested biomes covered with tall spruce trees. There are two variants in the biome family.

Description
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, ferns, large ferns and tall grass on the ground. Wolves, foxes and rabbits may spawn here. As the climate here is cold, rainfall changes to snowfall above the layer 200, though in the old growth spruce taiga variant, snowfall forms at layer 150. 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. There are overall more trees in old growth taigas compared to normal taigas, leading to increased foliage density. This makes wood more abundant, though as a large portion of it grows as part of tall 2&times;2 spruce trees, it may be more difficult to obtain. Old growth taigas are slightly more difficult for survival than regular taigas for this reason, though aren't so bad once acclimated and strategies are used to clear the tall trees; they may offer more unique views compared to regular taigas as well.

Variants
There are two old growth taiga biome variants (old growth pine taiga and old growth spruce taiga), with two removed variants (giant tree taiga hills and giant spruce taiga hills) in previous versions.

Old Growth Pine Taiga
The standard biome variant, old growth pine taiga features the typical terrain covered by coarse dirt, podzol and both large 2x2 and normal-sized spruce trees, with the tall trees being mostly arrow shaped with few leaves at the top, as well as forest rocks. Wolves, foxes and rabbits may spawn here.

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Old Growth Spruce Taiga
The old growth spruce taiga variant resembles the regular old growth taiga at first glance, with the main difference being the shape of the giant trees. The giant trees in old growth spruce taigas have leaves surrounding much more of the tree trunk, the larger amounts of leaves increases the chances of saplings dropping when these trees are cut down, leading to easier sustainability. This variant is also slightly colder than the regular biome, which means that snowfall starts at layer 150 instead of layer 200.

$$, old growth spruce taigas use the same mob spawning chances as old growth pine taiga for passive and ambient categories. As for the others:

$$, old growth spruce taigas use the same mob spawning chances as old growth pine taigas.

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