That scat is solid bee wings! I would consider it a serious problem and deal with it. The easiest solution is close bottom entrances and replace with upper or mid level entrance where critter has to stand up and expose less hairy belly. This allows bees to drive the critter off instead of it eating a pound a night of bees. Just cause you see one pile of scat, that does not mean it is the only one.
I had a terrible problem with skunks too. Tried raising the hives, carpet tack strips at the entrances. It helped reduce some of the problem, but then the bees became increasingly testy with persistent nightly harassment. Next step was to eliminate the skunks. That worked for a while, but Nature Abhors a Vacuum. More skunks migrated in fairly quickly to fill the void.
Trying upper entrances immediately solved the problem, thanks to Michael Bush. It took a bit of getting used to and some minor changes in inspection procedure, but now I don't ever have to worry about skunks or possums again.
Electric fence wire can work wonders. They make electric netting too. I often initially bait the electric fences i put up by hanging a few strips of aluminum foil smeared with peanut butter from the wires. Sounds kinda mean but it's better than shooting em! Negative reinforcement.
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