An ermine moth of genus Yponomeuta rests on the flower of a Charlock plant.
From Wikipedia (http://en.wikipedia.org/wiki/Ermine_moth):
The family Yponomeutidae are known as the ermine moths, with several hundred species, most of them in the tropics. The larvae tend to form communal webs, and some are minor pests in agriculture, forestry, and horticulture. Some of the adults are very attractive. Adult moths are minor pollinators.
CR2s converted in ACR
Blended for focus in PS CS5