Cite web URL http://www.mapoflife.org/topics/topic_76_Colour-vision-in-Firefly-squid/ Title Map of Life - 'Colour vision' in Firefly squid Website Convergent Evolution Online Publisher University of Cambridge URL access date 6 November 2012 ↑ Young, R.E.; Roper, C.F. (1976). "Bioluminescent countershading in midwater animals: evidence from living squid". Science.