What depth can *R. humilis* achieve when burrowing beneath the surface during its subterranean existence?
Answer
As deep as 20 metres (66 ft)
The primary mode of life for *R. humilis* is strictly subterranean, meaning it spends the overwhelming majority of its time beneath the soil surface. While it is often encountered closer to the surface, residing among roots or under logs and rocks, its physical capabilities allow for significantly deeper excursions. The text specifies that these snakes are capable of burrowing as deep as 20 metres, which is equivalent to approximately 66 feet. This extreme depth capability suggests a tolerance for varied temperatures and moisture levels found far below the immediate desert surface layer, although surface activity is nocturnal, especially after rain softens the ground.
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