Gyrfalcon1

Is this Crested Serpent Eagle a sub-adult (say 2nd or 3rd plumage) or is it a different subspecies than one sees in SE Asia? In other words, could it be from China or somewhere north of Laos, Vietnam, Thailand, etc.

http://photo.net/photodb/photo?photo_id=16526892

double-click to enlarge...it was photographed this past autumn at Khao Dinsor (Thailand).

Any comments/ideas appreciated.

Thanks,

Bob
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Robert DeCandido PhD