Vibrant black/yellow colouring. In batches, feeding on Dock.
No interactions present.
The plant in the photo looks too hairy for dock, I wonder if it could be Comfrey, which is one of their more frequent foodplants? But they will feed on a range of things in some places. In my area they are on Green Alkanet.
Entomologist and biological recorder
We were very certain at the time that it was dock... Comfrey does grow in the same area but we are sure it was not that. Will check when next there.
Thank you all 'agreements'.
Lat/Lng: 50.625278, -2.466944
OS grid ref: SY670807
Lake reserve. Caterpillars found on dock growing in hedgerow border.