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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.
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Posts
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.