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How humid is the interior of a termite nest?

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The interior of a termite nest maintains a very high level of relative humidity, typically ranging from 90 to 99 percent.1

Because termites possess a soft cuticle and are highly susceptible to desiccation, they construct nests that are sealed from the outside environment to preserve this moisture. This humid microclimate is likely maintained in part by the water produced as a byproduct of the termites' own metabolic processes.1