Here’s the warm and fuzzy part of this column: most birds really do mate for life. But here’s the cold side: They mess around.
And here’s the switch: Blame the ladies.
Ever since Charles Darwin postulated it would be to a bird’s evolutionary advantage to stick with the same mate for its entire life, poets and novelists and even scientists have thought that meant they would remain faithful
Article source: http://abcnews.go.com/Technology/birds-mate-life-cheat/story?id=18949572