So I've HEARD of intersex birds, especially ducks, but never seen one until today. During a dog walk through Black River Riparian Forest, accessed from Oakesdale/Monster Rd. on western edge of Renton, I had a Mallard with female body and big black splotch on bill, but iridescent green head like a drake, save for buffy-brown cheek. Photos in ebird checklist: https://ebird.org/view/checklist/S53393579
Not as sexy (pun intended) as that gynandromorph cardinal in Pennsylvania, but still a cool bird to stumble across. Clearly paired with a "normal" male Mallard. If you believe the internet, it is probably an aging female whose estrogen levels are low.

Jeff Bryant
Seattle
jbryant_68 AT yahoo

Sent from my iPad
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman11.u.washington.edu/pipermail/tweeters/attachments/20190304/a9a5960f/attachment.html>