Editing Homosexual behavior in animals (section)

====Black swans====
[[File:Black Swans.jpg|right|thumb|Male [[Black swan|black swans]] (''Cygnus atratus'')]]

An estimated one-quarter of all [[black swan]] pairings are of males. They steal nests, or form temporary threesomes with females to obtain eggs, driving away the female after she lays the eggs. The males spent time in each other's society, guarded the common territory, performed greeting ceremonies before each other, and (in the reproductive period) pre-marital rituals, and if one of the birds tried to sit on the other, an intense fight began.<ref name="ES" /><ref>{{cite journal | last = Braithwaite |first=L. W. | year = 1970 | title = The Black Swan | journal = Australian Natural History | volume = 16 | pages = 375–379 }}</ref> More of their [[swan|cygnet]]s survive to adulthood than those of different-sex pairs, possibly due to their superior ability to defend large portions of land. The same reasoning has been applied to male [[flamingo]] pairs raising chicks.<ref name=Bagemihl/>{{rp|487–491}}<ref name="Oslo gay animal show draws crowds">{{cite news| title=Oslo gay animal show draws crowds| work=[[BBC News]]| date=19 October 2006| url=http://news.bbc.co.uk/2/hi/europe/6066606.stm| access-date = 2009-06-15}}</ref>