imageWasps on cosmos

imageWasps on cosmos

Observation - imageWasps on cosmos - UK and Ireland. Description: We thought these were hornets but now think large wasps but they have been clustered on the stem of a cosmos plant for a least a week. Is this unusual behaviour?

We thought these were hornets but now think large wasps but they have been clustered on the stem of a cosmos plant for a least a week. Is this unusual behaviour?