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The markings of the Great Windmill do not match this spotting, as Victoria pointed out. I cannot say for sure what the species is, but Atrophaneura hector does look like it has the same markings on the wings.
http://www.projectnoah.org/spottings/595...
here is a pic of a great windmill on project noah
Although I didn't think that the Great Windmill had white markings on the upper forewing, whereas this butterfly does?
definitely looks like a great windmill, great spotting these species are threatened