Dear Kitty
How are you?
It's quite a surprise that you've found a Ferruginous duck at such a date, though MP's and around is the
best area for finding one.
Look at the eye and undertail coverts. They are white. Plus overall chestnut brown. In 'A Field Guide to
the Birds of Japan' it's also called White-eyed Pochard.
Cheers
S L Tai