wee-holes-in-sand

On wandering through my garden today,I spotted these holes. They are in a narrow border which is covered with slates - no sand nearby. Can anyone tell me what they are and are they friend or foe?

There are lots of them all over the border.
Thanks.
0
Posts
I think it is probably a lttle bee nesting in each hole. One bee per hole. Check to se if you see any flying in and out. If not, it might be ants. If they aren't in the way, just leave them bee
Lol.
I'll keep a watch to see if it's bees. Thanks.
Yes and photos please if you can!
We love a bee pic on here
wb- that was nearly as bad a joke as Verdun's!
I live in west central Scotland - not where that photo is...
Have watched.....look like elongated thin bees/wasps. Like hover flies? Watched one drag a beetle of some sort into a hole backwards. Didn't have camera or phone for pic. I will persevere.