That would probably be part of the not yet well defined Subterranean Biome group.
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How would things like termite mounds be classified? They have a different environment in the inner chambers, so perhaps some sort of a subbiome?
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I am not sure. I would think for most organisms, Subterranean is more for species who spend generations under ground without seeing the sun, as opposed to burrowers who go back and forth daily. But while some termites would venture forth to find food, others might never leave their nest, so, good question.
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Perhaps it could be divided caste by caste of such an eusocial organism? So for instance caste a is terrestrial while caste b is entirely subterranean.
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That’s an interesting suggestion. I wonder if it can actually be programmed to work that way.
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Pretty sure The Sapling did something like that sometime ago in the latest update…
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