SENSORY FRINGE EXPLOITATION. “In general, mimicry may be facilitated by exploiting visual vulnerabilities and evolve more readily at the peripheries of sensory perception. Many sexually deceptive orchids are predominantly red, green or white: colours that are all potentially difficult for hymenoptera to detect or distinguish from the background.”
http://link.springer.com/article/10.1007/s00114-009-0611-0