TIL that white throated sparrows have four sexes.

[todayilearned@noc.social]

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