313. Who lives in these holes?

At the back of our house on the stony path I have found some curious mounds of mainly earth but also very small twigs. About the size of a beer mat but rounded like a very small hill.

When I removed this 'nest' I could see a small tunnel. About a cm wide and perhaps (but I am not sure) several cms deep.

I am not sure who has built them and whether they are still there.

I found three such nest-holes in a square metre and there are probably more.

Our initial thoughts were a ground bee or a wasp but the 'nest' on top makes me unsure.

Can anyone help?





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