The tansy beetle (Chrysolina graminis) is a green leaf beetle, about the size of a small finger nail and with a metallic sheen. The common name derives from the tansy plant on which they often feed as both larvae and adults. In the United Kingdom, its range is currently restricted to about 45 km of the banks of the River Ouse centred on York, North Yorkshire. Although there are scattered records from across England some of these may represent mis-identifications of the mint beetle (Chrysolina herbacea), a more widespread species. Tansy beetles were certainly known from Wicken Fen near Cambridge, where they fed on mint (Mentha spp.) not tansy, but the last record for the beetle there was in 1981.