What environmental metric can a thriving worm snake population indirectly serve as an excellent indicator of?

Answer

A healthy, balanced, and relatively undisturbed layer of topsoil and decomposing wood

Due to their deep dependence on earthworms, worm snakes occupy a critical position reflecting subterranean ecosystem health. If soil compaction increases or water infiltration decreases due to disturbance, the earthworm habitat degrades rapidly, immediately cutting off the snake's food source. Therefore, observing a flourishing population of worm snakes acts as an indirect validation of robust subterranean biological activity. They serve as sentinels, indicating the presence of a healthy, balanced, and relatively undisturbed layer of topsoil and sufficient decomposing organic material necessary for their primary prey to thrive.

What environmental metric can a thriving worm snake population indirectly serve as an excellent indicator of?
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