Macroglossum stellatarum

CCC1597 [Macroglossum - Matthiola]

 I often see this day-flying moth - Macroglossum stellatarum – enjoy the nectar of Matthiola tricuspidata.
Is it a coincidence or the high quality of the nectar the moth is aware of? I wonder.
 
Photographed in Oropos on February 10, 2011