<![CDATA[TIL that white throated sparrows have four sexes.]]>TIL that white throated sparrows have four sexes. An inverted section of Chromosome 2 acts as a separate sex gene, carrying behavior differences that cause only pairs with a mismatch to be successful breeders.

https://www.sciencehistory.org/stories/disappearing-pod/the-bird-with-four-sexes/

https://www.reddit.com/r/todayilearned/comments/1sfknme/til_that_white_throated_sparrows_have_four_sexes/

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