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Birds who freely choose their own mates have more offspring
- dang 11y agoUrl changed from http://washington.cbslocal.com/2015/09/16/study-birds-fall-in-love-reproduce-more-when-they-do/ http://washington.cbslocal.com/2015/09/16/study-birds-fall-i..., which points to this, which admittedly isn't an original source either.