See also: https://zoraweb.com/mercury-mess-wild-bird-sex-stifled https://www.pnas.org/doi/10.1073/pnas.0909519107(link is external) Source https://www.youtube.com/watch?v=yYqb95GkD4I(link is external) See also Mercury mess: Wild bird sex stifled mouse universe (heaven for mice) (link is external)