by Dan8267 follow (4)
http://www.sciencedaily.com/releases/2012/05/120514122838.htm?ref=patrick.net
Blue eggs are a sign that the offspring will be healthy and thus encourage the father to stick around to feed them. Evolution drives the desire and benefit of bluer eggs.
Evolution also drives cockroaches to lose their sweet tooth. http://www.newsdaily.com/article/c35e4e60019c1b78eb557f0be44c700e/cockroaches-quickly-lose-sweet-tooth--to-survive?ref=patrick.net
http://www.sciencedaily.com/releases/2012/05/120514122838.htm?ref=patrick.net
Blue eggs are a sign that the offspring will be healthy and thus encourage the father to stick around to feed them. Evolution drives the desire and benefit of bluer eggs.
Evolution also drives cockroaches to lose their sweet tooth.
http://www.newsdaily.com/article/c35e4e60019c1b78eb557f0be44c700e/cockroaches-quickly-lose-sweet-tooth--to-survive?ref=patrick.net