"I swear I never saw so many bugs and caterpillars at one place! These two were hidden deeply in the ground, moved them on a safe side and covered with soil so they can continue napping. So many living organisms in one place can only mean one thing!
Soil is too rich in minerals"
Very good job and deep research that you have done. Certainly true, where most of these burrowing animals are found are clear indication of the soil being rich. Since most of these animals would serve as humus when they die and decompose into the soil. Again, they pore holes into the soil to encourage aeration and good water retention.
Exactly, not just that they will be decomposed, also their poop contributes to soil quality.
Viva la earthworms!