Your skunks are probably looking for beetles...june bugs, japanese beetles. The skunks and possums do that in my yard and I have to collect the scat first thing in the mornings. Filled with little green sparkles from the Japanese Beetles. That and Fox scat and Owl pellets and I am not even out in the country!
You are correct about beetles (& grubs). We are probably going to have a June bug hatch with the rain yesterday & heat. The Japanese beetles are already around & eating up stuff.