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Aix galericulata
Either a juvenile or a male in molt - strange looking.
I have the confirmation that this is a male Mandarin Duck in non-breeding plumage. The orange "spikes" will develop into part of the colorful breeding plumage.
Looking at the Mandarin in my book - your photo has the wrong bill colouring - the female tufted seems the nearest ?
Thanks for the ID suggestion but it doesn't look anything like a Tufted Duck to me. But not too healthy, that's what I thought, too.