Dietary protein level affects iridescent coloration in Anna's hummingbirds, Calypte anna Meadows, M. G. ; Roudybush, T. E. ; McGraw, K. J. Abstract Publication: Journal of Experimental Biology Pub Date: August 2012 DOI: 10.1242/jeb.069351 Bibcode: 2012JExpB.215.2742M