https://i.imgur.com/GUHwN5A.jpg from a local rural So(uthern)
CA(lifornia) house.

Gophers? Deers? Dogs? Squirrels? I doubt it is the ants even though
there are Red Imported Fire and Argentine ants' mounds.

The next door neighbors' lawns don't even have this problem. What is
missing and how to stop these dig ups?

Thank you in advance.
--
"I do not believe that the Great Society is the ordered, changeless and
sterile battalion of the ants. It is the excitement of becoming--always
becoming, trying, probing, falling, resting and trying again--but always
trying and always gaining. In each generation--with toil and tears--we
have had to earn our heritage again." --Lyndon B. Johnson
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