An article in Science Daily discusses the possibility of a third gender in a tree that is closely related to the Olive Tree: http://www.sciencedaily.com/releases/2010/03/100331141614.htm
A detailed article discussing same sex pairs in animals in the New York Times: http://www.nytimes.com/2010/04/04/magazine/04animals-t.html?src=me&ref=general
Natural History Wanderings 
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