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Solitary bee / wasp holes?

Observed: 20th June 2012 By: RachRRachR’s reputation in InvertebratesRachR’s reputation in InvertebratesRachR’s reputation in Invertebrates
IMG_0026
IMG_0027
Description:

Found on an ex colliery site. Please can anyone help identify the species or group likely to have made these holes? Hopefully you can see from the photo that the entrance to the holes had been built up with mud and was raised above the ground surface

Identifications
Species interactions

No interactions present.