Intriguing, nice investigation Sean.
-- A search on eBird's Macaulay Library also shows nearly all male Northern Shoveler x Cinnamon Teal hybrids with a white crescent and rufous breast area (a more understandable trait) like this bird.
https://ebird.org/media/catalog?taxonCode=x00630&q=Cinnamon%20Teal%20x%20Northern%20Shoveler%20(hybrid)%20-%20Spatula%20cyanoptera%20x%20clypeata
I suppose this could mean one of the two parent species (Northern Shoveler or Cinnamon Teal) has a repressed version (unexpressed gene) of a Blue-winged Teal's white crescent somewhere in its genome, while the other parent species contribute's some transcription factor that initiates that gene's expression. Fascinating.
David Tonnessen
Colorado Springs
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